Create README.md

Author: luisnquin

README.md

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+# Flask REST API with mongoDB ```py 3.10```
+First, to install all dependencies:
+```
+python -m pip install -r requirements.txt
+```
+
+Second, into the ./src/ folder, copypaste this:
+```
+$env:FLASK_APP="app.py"
+flask run
+```
+If you reject to me, this:
+```
+py app.py
+```
+
+Obviusly, make sure you have ```mongod``` running on.
+
+## Source code
+<img src="https://i.ibb.co/cK5v7rJ/Flask-REST-API-mongo-DB.png" alt="Flask-REST-API-mongo-DB">