steamos CD deployment (#8)

build/steamos/README.md

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+
+# buildmachine exclusive steam user:
+
+see https://partner.steamgames.com/doc/sdk/uploading#Build_Account
+
+# buildmachine auth key
+
+go on a linux x86 machine:
+
+```
+mkdir ~/Steam && cd ~/Steam
+curl -sqL "https://steamcdn-a.akamaihd.net/client/installer/steamcmd_linux.tar.gz" | tar zxvf -
+chmod +x ~/Steam/
+~/Steam/steamcmd.sh +help +quit
+```
+
+now we have to login with out ci account:
+
+```
+~/Steam/steamcmd.sh +login USERNAME +quit
+```
+
+If succesfull this creates `~/Steam/config/config.vdf`.
+
+On a mac:
+```
+cat config.vdf | gzip | base64 | pbcopy
+```
+
+The gzipped and base64 encoded file is now in the clipboard and ready to be put into a CI secret.