Added usage instructions

README.md

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+FabFire Adapter
+===
+The FabFire adapter translates mqtt messages from the reader hardware to api calls to bffhd.
+
+# Usage
+## Configuration in `config.toml`
+1. Set `hostname` and `port` for your MQTT Broker and bffhd instance
+2. Add your readers to the `[readers]` section. Every reader needs a unique subsection name:
+```toml
+[readers]
+    [readers.REPLACEME]
+    id = "111"
+    machine = "urn:fabaccess:resource:Testmachine"
+
+    [readers.REPLACEMETOO]
+    id = "222"
+    machine = "urn:fabaccess:resource:Another"
+```
+
+## Running
+1. Install the requirements with `pip install -r requirements.txt`
+2. Run the adapter with at least python 3.7
+```shell
+python3 main.py
+```
+3. The adapter has to remain running for the readers to work
+
+# Provisioning
+
+See the [provisioning tool](https://gitlab.com/fabinfra/fabaccess/FabFire-Provisioning-Tool) repo.