docs: update examples

Author: Greg Bowler

example/01-json-encode.php

@@ -0,0 +1,16 @@
+<?php
+
+use Gt\DataObject\DataObject;
+
+require __DIR__ . "/../vendor/autoload.php";
+
+$obj = (new DataObject())
+	->with("name", "Cody")
+	->with("colour", "orange")
+	->with("food", [
+		"biscuits",
+		"mushrooms",
+		"corn on the cob",
+	]);
+
+echo json_encode($obj);

example/02-json-decode.php

@@ -0,0 +1,22 @@
+<?php
+
+use Gt\DataObject\DataObject;
+
+require __DIR__ . "/../vendor/autoload.php";
+
+// Set an object with all string values, similar to a web requests:
+$obj = new DataObject();
+$obj = $obj->with("one", "1");
+$obj = $obj->with("two", "two");
+$obj = $obj->with("pi", "3.14159");
+
+// Automatically cast to int:
+
+$int1 = $obj->getInt("one");
+$int2 = $obj->getInt("two");
+$int3 = $obj->getInt("pi");
+
+echo "One: $int1, two: $int2, three: $int3", PHP_EOL;
+// Outputs: One: 1, two: 0, three: 3
+// Note how the decimal data is lost in the cast to int,
+// but how the original data is not lost.

example/03-type-casting.php

@@ -0,0 +1,3 @@
+<?php
+
+require __DIR__ . "/../vendor/autoload.php";