Adds CI readme.

ci/README.md

@@ -0,0 +1,23 @@
+# Build Instructions for AppImage
+
+This folder contains a `Dockerfile` to create a AppImage for Kristall.
+
+Requirements:
+- docker
+- docker-compose
+
+Build process:
+```sh
+docker build --tag kristall-ci:1.0 .
+docker-compose up
+```
+
+This will create two files in the output folder:
+- `kristall`
+  The raw binary output
+- `Kristall-nightly-x86_64.AppImage`
+  The *AppImage* build of Kristall, should run on any 
+  
+Result was tested on:
+- Gentoo / Kernel 5.4.48
+- Arch Linux / Kernel 5.7.6