docs: update instructions

Author: john0isaac

README.md

@@ -12,12 +12,11 @@ To run the Flask application, follow these steps:
     cd flask-api-sqlite-db
     ```
 
-1. **Install, initialize and activate a virtualenv using:**
+1. **Initialize and activate a virtualenv using:**
 
     ```bash
-    pip install virtualenv
-    python -m virtualenv venv
-    source venv/bin/activate
+    python3 -m venv .venv
+    source .venv/bin/activate
     ```
 
     >**Note** - In Windows, the `venv` does not have a `bin` directory. Therefore, you'd use the analogous command shown below:
@@ -26,20 +25,25 @@ To run the Flask application, follow these steps:
     source venv\Scripts\activate
     ```
 
-1. **Install the dependencies:**
+1. **Install the app as an editable package:**
 
     ```bash
-    pip install -r requirements.txt
+    python3 -m pip install -e src
     ```
 
-1. **Execute the following command in your terminal to start the flask app**
+1. **Execute the following command to add the database name and apply the migrations:**
 
     ```bash
     export DATABASE_FILENAME=testdb.db
-    export FLASK_APP=src.app
-    export FLASK_ENV=development
-    flask run --reload
+    python3 -m flask --app src.flaskapp db upgrade --directory src/flaskapp/migrations
     ```
+
+1. **Execute the following command to run the flask application:**
+
+    ```bash
+    python3 -m flask --app src.flaskapp run --reload
+    ```
+
 ### Run the tests
 
 1. **Inside your virtual environment, execute the following command to run the tests**