Update flat-polyfill.md

Merge pull request #1 from prachi09051999/prachi09051999-patch-1

Updated flat-polyfill.md

Created flat-polyfill.md

Update Currying-in-Javascript.md

Added Currying function in Javascript

Added Flatten the Array function implementation

Typescript Practice

Create Promise-methods-polyfills.md

Update Debounce-and-Throttle.md

Create Debounce-and-Throttle.md

Update README.md

Update README.md

Update README.md

Initial commit