add EC82 rule: use final variable

RULES.md

@@ -59,7 +59,7 @@ Some are applicable for different technologies.
 | EC78     | Const parameter in batch update                               | Don't set const parameter in batch update => Put its in query. Creating this parameter and destroying it consumes CPU cycles and RAM unnecessarily.                                                                                                                                                                                                                                                                          |                                                                                                                                                                         | ✅    | 🚫  | 🚫 | 🚫     | 🚫   | 🚫 | 🚫   |
 | EC79     | Free resources                                                | try-with-resources Statement needs to be implemented for any object that implements the AutoCloseable interface, it save computer resources.                                                                                                                                                                                                                                                                                 |                                                                                                                                                                         | ✅    | 🚫  | 🚫 | 🚫     | 🚫   | 🚫 | 🚫   |
 | EC81     | Specify struct layouts                                        | When possible, specify struct layouts to optimize their memory footprint                                                                                                                                                                                                                                                                                                                                                     |                                                                                                                                                                         | 🚫   | 🚫  | 🚫 | 🚫     | 🚫   | ✅  | 🚫   |
-| EC82     | Make variable constant                                        | A variable is never reassigned and can be made constant                                                                                                                                                                                                                                                                                                                                                                      |                                                                                                                                                                         | 🚀   | 🚀  | 🚀 | 🚀     | 🚀   | ✅  | 🚫   |
+| EC82     | Make variable constant                                        | A variable is never reassigned and can be made constant                                                                                                                                                                                                                                                                                                                                                                      |                                                                                                                                                                         | ✅   | 🚀  | 🚀 | 🚀     | 🚀   | ✅  | 🚫   |
 | EC83     | Replace Enum ToString() with nameof                           | When no string format is applied, use nameof instead of ToString() for performance                                                                                                                                                                                                                                                                                                                                           |                                                                                                                                                                         | 🚫   | 🚫  | 🚫 | 🚫     | 🚫   | ✅  | 🚫   |
 | EC84     | Avoid async void methods                                      | Use async Task methods instead, for performance, stability and testability                                                                                                                                                                                                                                                                                                                                                   |                                                                                                                                                                         | 🚫   | 🚫  | 🚫 | 🚫     | 🚫   | ✅  | 🚫   |
 | EC85     | Make type sealed                                              | Seal types that don't need inheritance for performance reasons                                                                                                                                                                                                                                                                                                                                                               |                                                                                                                                                                         | 🚫   | 🚫  | 🚫 | 🚫     | 🚫   | ✅  | 🚫   |

ecocode-rules-specifications/src/main/rules/EC82/java/EC82.asciidoc

@@ -0,0 +1,31 @@
+:!sectids:
+
+Variable can be made constant.
+
+## Why is this an issue ?
+
+Unlike variables, constant values are known at compile time and are injected as is in the code, requiring no runtime processing and therefore reducing the environmental footprint.
+Although good compilers will const eligible variables by themselves, it is still good practice to declare them constant, as it makes the code intent clearer.
+
+### When can it be ignored ?
+
+This rule should not be ignored.
+
+## Non-compliant examples
+
+```java
+public void Ec82NonCompliant() {
+        String test = "test"; // Non compliant, i is never reassigned and can be made constant
+        System.out.println(test);
+}
+```
+## Compliant examples
+
+```java
+final String test = "test";
+
+public void Ec82Compliant()
+{
+    System.out.println(test);
+}
+```