docs: add contributing.md and additional instructions on building the docs.

CONTRIBUTING.md

@@ -0,0 +1,28 @@
+# Contributing
+
+Contributions are welcome, including bug reports, implementing features or writing documentation.
+
+## Dev Environment Setup
+
+The recommended way is:
+
+1. Build the docker image, setting the version to a number of your choosing
+    ```bash
+    docker build --network=host --tag bbernhard/signal-cli-rest-api:<a dev version> .
+    ```
+2. Adjust the `docker-compose.yml`
+    * Replace the `image: bbernhard/signal-cli-rest-api:latest` for `image: bbernhard/signal-cli-rest-api:<a dev version>`
+    * Add the version to the environment:
+        ```yml
+        environment:
+            - BUILD_VERSION=<a dev version>
+        ```
+3. Run the image
+    ```bash
+    docker compose up
+    ```
+4. Make code changes and repeat steps 1 to 3
+
+## Building the documentation
+
+Follow the instructions in the docs [readme page](./src/docs/README.md).

src/docs/README.md

@@ -10,4 +10,23 @@ Or, if you have `swag` installed:
 
 ```bash
 swag init
-```
+```
+
+Then run the app in `/src`
+
+```bash
+go run main.go
+```
+
+Or with the docker compose in the root of the repository
+```bash
+docker compose up
+```
+
+And navigate to the following address to view the docs
+
+http://127.0.0.1:8080/swagger/index.html
+
+On docker you'll get a Network error, replace the IP for the docker internal IP in the error, e.g:
+
+http://172.18.0.2:8080/swagger/index.html