docs: added running-the-web-app.md (#269)

docs/contributing-to-keyshade/running-things-locally/running-the-web-app.md

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+---
+description: Get to know how you can run the web app!
+---
+
+## Running the Web App
+
+The Web App resides in the `apps/web` directory. It is powered by NextJS and TypeScript. To run the Web App locally, do the following:
+
+* In the project root, run:
+
+```sh
+pnpm i
+```
+
+Next set up the web app for development with:
+
+```sh
+pnpm dev:web
+```
+
+* Or cd into `apps/web` and run:
+
+```sh
+pnpm dev
+```
+
+## Testing your code
+
+We use Jest for testing. Run the tests when unit testing, or mock testing the web app separately from the rest of the project.
+
+* To run tests in the root, use this command:
+
+```sh
+pnpm test:web
+```
+
+## Viewing the Web App
+
+* You can view the web app by opening the http://localhost:6969 URL in a browser.
+
+