Added read me prisma documentation and .env.example file

.env.example

@@ -0,0 +1 @@
+DATABASE_URL="postgresql://db_username:db_user_pwd@localhost:db_port/db?schema=db_schema"

README.md

@@ -42,3 +42,20 @@ To check for code issues using [ESLint](https://eslint.org/), run:
 ```bash
 npm run lint
 ```
+
+To run run prisma, you have two steps:
+
+- First is to generate the schema in the database:
+   - To just generate the database and not create a migration:
+      ```bash
+      npx prisma db push
+      ```
+
+   - To generate the database and also create a migration:
+      ```bash
+      npx prisma migrate dev --name init
+      ```
+- Second is to generate the prisma client. This step is required also after every pull because prisma client is stored in the `node_modules` folder which is in the `.gitignore`
+```bash
+npx prisma generate
+```