Create scripts that handle building from source automatically

scripts/README.md

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+# Introduction
+Sunshine is a Gamestream host for Moonlight
+
+[![AppVeyor Build Status](https://ci.appveyor.com/api/projects/status/cgrtw2g3fq9b0b70/branch/master?svg=true)](https://ci.appveyor.com/project/loki-47-6F-64/sunshine/branch/master)
+[![Downloads](https://img.shields.io/github/downloads/Loki-47-6F-64/sunshine/total)](https://github.com/Loki-47-6F-64/sunshine/releases)
+
+You may wish to simply build sunshine from source, without bloating your OS with development files.
+These scripts will create a docker images that have the necessary packages. As a result, removing the development files after you're done is a single command away.
+These scripts use docker under the hood, as such, they can only be used to compile the Linux version
+
+
+#### Requirements
+
+```
+sudo apt install docker
+```
+
+#### instructions
+
+You'll require one of the following Dockerfiles:
+* Dockerfile-2004 --> Ubuntu 20.04
+* Dockerfile-2104 --> Ubuntu 21.04
+* Dockerfile-debian --> Debian Bullseye
+
+Depending on your system, the build-* scripts may need root privilleges
+
+First, the docker container needs to be created:
+```
+cd scripts
+./build-container.sh -f Dockerfile-<name>
+```
+
+Then, the sources will be compiled and the debian package generated:
+```
+./build-sunshine -p -s ..
+```
+You can run `build-sunshine -p -s ..` again as long as the docker container exists.
+
+```
+git pull
+./build-sunshine -p -s ..
+```
+
+Optionally, the docker container can be removed after you're finished:
+```
+./build-container.sh -c delete
+```
+
+Finally install the resulting package:
+```
+sudo apt install -f sunshine-build/sunshine.deb
+```
+