Updated readme to mention in-memory coordinator implementation

Signed-off-by: Thomas Kosiewski <[email protected]>

README.md

@@ -1,22 +1,30 @@
 # Tailscale Coordinator Library
 
-This is a library that simplifies the implementation and integration of a control server for Tailscale into your Go application.
+This is a library that simplifies the implementation and integration of a control
+server for Tailscale into your Go application.
 
 ## Disclaimer
 
-This project is not affiliated with Tailscale or Tailscale Inc., and it is not an official Tailscale or Tailscale Inc. project.
+This project is not affiliated with Tailscale or Tailscale Inc., and it is not an
+official Tailscale or Tailscale Inc. project.
 
 ## Installation
 
-To install the library, run the following command:
+You can install the library using the `go get` command:
 
 ```bash
 go get github.com/loft-sh/tunnel
 ```
 
 ## Usage
 
-To use the library, import it into your Go code and implement the tailscale coordinator interface:
+There are two main ways to use this library: as a standalone library in your Go
+code, or as an in-memory coordinator for end-to-end testing.
+
+### Using the Library in Your Go Code
+
+To use the library in your Go code, you'll need to import it and implement the
+Tailscale coordinator interface.
 
 ```go
 package main
@@ -45,9 +53,24 @@ func NewCoordinator() tunnel.Coordinator {
 }
 ```
 
-## Inspiration
+### Using the In-Memory Coordinator
+
+We also provide an in-memory control server, which is useful for running end-to-end
+tests in a continuous integration or test environment. This server comes with
+pre-configured profiles and nodes.
+
+You can find an example of this server in the [examples/coordinator/](./examples/coordinator/)
+directory.
 
-This project is inspired by open-source tailscale control server implementations such as:
+To configure the server, edit the [config file](./examples/coordinator/config.json).
+Then, run the server with the following commands:
+
+```bash
+cd examples/coordinator
+go run server.go
+```
+
+## Inspiration
 
-- [Headscale](https://headscale.net)
-- [Ionscale](https://jsiebens.github.io/ionscale/)
+This project was inspired by open-source Tailscale control server implementations
+such as [Headscale](https://headscale.net) and [Ionscale](https://jsiebens.github.io/ionscale/).