Add readme for style guide

README.md

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+# Style guide
+
+## Code blocks
+
+PrismJS is used to provide highlighting when the right programming language name is given
+
+### Bash / SH
+
+Shell highlighting uses additional keywords in markdown to set a desired prefix
+
+Available options are `[shroot]` and `[shuser]`
+
+Usage:
+
+````
+[shroot]
+
+```
+echo hello
+```
+
+[/shroot]
+````
+
+## Variables / Fill your own
+
+Values that should be replaced by the reader are generally represented this way:  
+`[VALUE]`