Add local setup information to README

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 # Python Discord Forms (Backend)
-API for Python Discord forms (https://forms.pythondiscord.com) that handles Discord login and forms submissions.
+API for Python Discord forms (https://forms.pythondiscord.com) that handles Discord login and forms, submissions.
+
+## Setup
+### Prerequisites
+To start working on forms-backend, you need few things:
+1. Discord Application (in [Developers Portal](https://discord.com/developers/applications))
+2. Poetry
+3. Docker and docker-compose (optional)
+4. Running MongoDB instance (when not using Docker)
+
+### Running with Docker
+Easiest way to run this is using Docker (and docker-compose).
+
+#### Environment variables
+Set following environment variables to `.env` file:
+- `OAUTH2_CLIENT_ID`: Client ID of Discord Application (prerequisites point 1).
+- `OAUTH2_CLIENT_SECRET`: Client Secret of Discord Application (prerequisites point 1).
+- `ALLOWED_URL`: Allowed origin for CORS middleware.
+
+#### Running
+Running is really for this way: `docker-compose up`! And this is all: You can access now API from `http://localhost:8000`.
+
+### Running on host
+Another way to run forms-backend is manually in host.
+
+#### Environment variables
+First all same than in Docker environment variables section, with following additions:
+- `DATABASE_URL`: MongoDB instance URI, in format `mongodb://(username):(password)@(database IP or domain):(port)`.
+- `MONGO_DB`: MongoDB database name, defaults to `pydis_forms`.
+
+#### Running
+Almost same easy than for Docker: `uvicorn --reload --host 0.0.0.0 --debug "backend:app`.