Update README.md

Author: Ansari1120

README.md

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 # CLI-Based-Calculator-Using-Node-js-And-TypeScript
 this is the Source code of Node js and Typescript Based Calculator Runs on the Command line Interface , its package Also published at NPM Marketplace with the name : npx CalCli
-added an cli User Input with package Prompt Sync from NPM 
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+1) added an cli User Input with package Prompt Sync from NPM 
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+2) initialized typescript enviroment through npx tsc -init
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+3) intialized node js enviroment npm init -yes
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+4) added calculator basic opetaions features - , + , * , /
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+5) taking user input with strict checkings (empty inputs , only one input , aplphabet input instead of numeric).