Add Assignment 1 readme

Assignment1.md

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+# Assignment 1: CRUD Question Bank
+
+## To setup and execute
+
+1. Download the zip file named `ay2324s1-course-assessment-g17-Assignment-1-updated.zip` from [Assignment-1-updated](https://github.com/CS3219-AY2324S1/ay2324s1-course-assessment-g17/releases/tag/Assignment-1-updated).
+2. Unzip the file and navigate to the folder `ay2324s1-course-assessment-g17-Assignment-1-updated`.
+3. Set up the environment variables in `.env` for `backend/question-service` and `frontend`.
+4. `cd` into `backend/question-service` and `frontend`. Run `npm install` to install the dependencies for `question-service` and `frontend`.
+
+    Note: You may need to run `npm i --save-dev @types/cors` and `npm i --save-dev @types/express` should you encounter any errors.
+
+5. In `frontend` and `backend/question-service`, run `npm start`.