📝 Add platform docs (#139)

Author: joyliu-q

README.md

@@ -27,3 +27,56 @@ SENTRY_URL=https://[email protected]/product
 Routes are defined in `/pennlabs/urls.py` and subsequent app folders in the form of `*/urls.py`. Account/authorization related scripts are located in `accounts/` and Penn Labs related scripts are located in `org/`.
 
 Documentation about individual endpoints is available through the `documentation/` route when the Django app is running.
+
+## Installation
+You will need to start both the backend and the frontend to do Platform development.
+
+### Backend
+
+Running the backend requires [Python 3](https://www.python.org/downloads/).
+
+To run the server, `cd` to the folder where you cloned `penn-clubs`. Then run:
+- `cd backend`
+
+Setting up `psycopg2` (this is necessary if you want to be able to modify
+dependencies, you can revisit later if not)
+
+- Mac
+  - `$ brew install postgresql`
+  - `$ brew install openssl`
+  - `$ brew unlink openssl && brew link openssl --force`
+  - `$ echo 'export PATH="/usr/local/opt/openssl@3/bin:$PATH"' >> ~/.zshrc`
+  - `$ export LDFLAGS="-L/usr/local/opt/openssl@3/lib"`
+  - `$ export CPPFLAGS="-I/usr/local/opt/openssl@3/include"`
+- Windows
+  - `$ apt-get install gcc python3-dev libpq-dev`
+
+Now, you can run 
+
+- `$ pipenv install` to install Python dependencies. This may take a few
+  minutes. Optionally include the `--dev` argument if you are installing locally
+  for development. If you skipped installing `psycopg2` earlier, you might see
+  an error with locking -- this is expected!
+- `$ pipenv shell`
+- `$ ./manage.py migrate` OR `$ python3 manage.py migrate`
+- `$ ./manage.py populate_users` OR `$ python3 manage.py populate_users` (in development,
+  to populate the database with dummy data)
+- `$ ./manage.py runserver` OR `$ python3 manage.py runserver`
+
+### Frontend
+
+Running the frontend requires [Node.js](https://nodejs.org/en/) and [Yarn](https://yarnpkg.com/getting-started/install).
+
+You will need to set the following environment variables on the frontend:
+- `NEXT_PUBLIC_GOOGLE_API_KEY`
+- `NEXT_PUBLIC_SITE_NAME` (Optional)
+  - Specify `clubs` to show Penn Clubs and `fyh` to show Hub@Penn.
+
+1. Enter the `frontend` directory with a **new terminal window**. Don't kill your backend server!
+2. Install dependencies using `yarn install` in the project directory.
+3. Run application using `yarn dev`.
+4. Access application at [http://localhost:3000](http://localhost:3000).
+
+### Development
+
+Click `Login` to log in as a test user. The `./manage.py populate_users` command creates a test user for you with username `bfranklin` and password `test`. Go to `/api/admin` to login to this account.