Add setup instructions to README

Add instructions for setting up the environment variables.

Author: PaoloGiacosa

README.md

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+This is the part of Outdoorz which implement the business logic of the social network 
+
+All you have to do is create a .env file which has to be the same in OutdoorzSocial and OutdoorzMedia with the following fields:
+DB_PASSWORD=<db password>
+ENCRYPTION_KEY=<encryption key>
+JWT_SECRET=<jwt secret>
+
+Note: DB_PASSWORD must be the same ad in the .env in the same dir as docker-compose or service.yaml
+The jwt secret must be long at least 32 character.
+
+
+