Add mac signing guide

Docs/macOSSigning.md

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+# ScreenPlay macOS signing full guide
+
+## Create a developer account and certs
+1. Pay the 99$ Apple tax
+2. Create a app password for distribution outside of the app store
+- Go to https://appleid.apple.com/account/manage
+- Call it ScreenPlay and save the password!
+3. Next we need a developer certificate:
+- Go to https://developer.apple.com/account/resources/certificates/list
+- Click the blue plus sign
+- Select `Developer ID Application`
+    - _This certificate is used to code sign your app for distribution outside of the Mac App Store._
+
+## Sign the app locally with codesign
+We need to sign every single file in the .app file. For this we use the name from the installed cert. This can be copied from the `Keychain Access.app`.
+
+`codesign --deep -f -s "Developer ID Application: Elias Steurer (AAABCXYZAA)" --options "runtime" "ScreenPlay.app/"`
+
+## Upload to apple for notization
+We use [xcnotary](https://github.com/akeru-inc/xcnotary) tools for fast automatic upload. Install it via brew:
+
+`brew install akeru-inc/tap/xcnotary`
+
+Then run it with the 
+- `*.app` name
+- `-d` the developer account email and 
+- `-k` command is here the keychain name that contains your password from the app password step above!
+
+`xcnotary notarize ScreenPlay.app -d yourDeveloperAccountEmail@example.com -k ScreenPlay`