Add docker-compose examples (#339)

examples/docker-compose/README.md

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+## Prerequisites
+
+### Kernel Module
+
+Depending on if the Wireguard kernel module is available on your system you have more or less choices which example to use.
+
+You can check if the kernel modules are available via the following command:
+```shell
+modprobe wireguard
+```
+
+If the command exits successfully and doesn't print an error the kernel modules are available.
+If it does error, you either have to install them manually (or activate if deactivated) or use an userspace implementation.
+For an example of an userspace implementation, see _borigtun_.
+
+### Credentials
+
+Username and password for all examples is `admin` by default.
+For security reasons it's highly recommended to change them before the first startup.
+
+## Examples
+- **[system](system.yml)**
+
+  If you have Wireguard already installed on your system and only want to run the UI in docker this might fit the most.
+- **[linuxserver](linuxserver.yml)**
+
+  If you have the Wireguard kernel modules installed (included in the mainline kernel since version 5.6) but want it running inside of docker, this might fit the most.
+- **[boringtun](boringtun.yml)**
+
+  If Wireguard kernel modules are not available, you can switch to an userspace implementation like [boringtun](https://github.com/cloudflare/boringtun).