basic setup for web and created frontend#225

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MUKESHSIHAG wants to merge 6 commits into

aerospaceresearch:masterfrom

MUKESHSIHAG:web

Commits on Jan 30, 2020

Commits on Feb 2, 2020

Simplify and Factorial Button are working properly
MUKESHSIHAG
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Commits on Feb 11, 2020

Functionality added for DEL and CLEAR button
MUKESHSIHAG
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Commits on Feb 21, 2020

Simplify_expr function is added to simplify expressions for e.g. 'sin(x)^2+cos(x)^2+3+x^2'
MUKESHSIHAG
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Commits on Feb 28, 2020

trying to solve linting errors
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