Update README

Add development and testing section.

Author: jacomago

README.md

@@ -1,8 +1,8 @@
 # pyCFClient
-A python client library
 
+A python client library for ChannelFinder. Requires python >= 3.8.
 
-### configuration for pyCFClient
+## Configuration
 
 The python channelfinder client library can be configured by setting up a `channelfinderapi.conf` file in the following locations
 
@@ -11,6 +11,7 @@ The python channelfinder client library can be configured by setting up a `chann
 `channelfinderapi.conf`  
 
 The example preferences:  
+
 ```
 cat ~/channelfinderapi.conf  
 [DEFAULT]  
@@ -19,3 +20,22 @@ username=MyUserName
 password=MyPassword  
 ```
 
+## Development
+
+To install with dependancies for testing.
+
+```bash
+python -m pip install --upgrade pip
+python -m pip install '.[test]'
+python -m pip install .
+```
+
+### Testing
+
+Some of the tests use docker to run a test ChannelFinderService, so a working docker installation needs to available for tests to be successful.
+
+To run all tests:
+
+```bash
+python -m unittest discover -v -s test -p "test*.py"
+```