feat: add documentation for workflow

.github/workflows/README.md

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+## **To run this CI/CD Workflow:**
+-  Simply, make a PR to the `main` branch or push changes to the `main` branch
+- Go to the `Actions` Tab to view the status of the workflow.
+
+## Details of Implementation
+- **CI Pipeline**
+  - Specify that the CI Pipeline is triggered on PR or push to `main`
+  - Checkout code via `Github Actions`
+  - Install `docker-compose`
+  - Log in to Docker Hub 
+  - Run `docker-compose build` to build frontend and backend images
+    - **Note**: we have defined a redis container within the docker-compose file in case that we want to implement a test suite that requires redis to run
+  - Tag frontend and backend images and push them to Docker Hub
+  - List docker images 
+- **CD Pipeline**
+  - Specify workflow to run only after CI Pipeline has been completed
+  - Run code on `ubuntu-latest` 
+  - Checkout code via `Github Actions`
+  - Log in to Docker Hub
+  - Pull Docker backend and frontend images
+  - Deploy backend and frontend containers
+  - Run Automated Tests on backend and frontend
+    - We first install necessary packages (i.e. `npm install`)
+    - Then, we run `npm test` for the respective containers each having their own test suite
+

.github/workflows/SystemDesign.md

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+## **System Design for Building, Pushing, Deploying Docker**
+### **CI Pipeline**
+- `A2_Part1.yml` file
+  - Responsible for building docker images for the frontend and backend and pushing them to DockerHub
+- `A2_Part2.yml` file
+  - Responsible for pulling frontend and backend containers and running automated tests within their respective containers
+
+
+
+## **System Design for Automated Testing**
+### **Backend**
+- In `package.json`:
+- `npm test`
+    - runs `jest --coverage --forceExit --maxWorkers=2`
+- In `__ tests __` :
+  - `setProfilePic.test.js`
+    - verify that making `POST` request at `/set-profile-pic` endpoint results in 200 response code
+###  **Frontend**
+- In `package.json`:
+  - `npm test`
+    - runs `jest --coverage --transformIgnorePatterns \"node_modules/(?!axios)/\"`
+- In `__ tests __` :
+  - `LoginPage.test.js`:
+    - check that the Login component contains the phrase “Swipe. Match. Network.”