style(bash): added decision to start using bash style guide [ci skip]

.vscode/settings.json

@@ -25,5 +25,6 @@
   },
   "yaml.schemas": {
     "http://json-schema.org/draft/2019-09/schema#": "values-schema.yaml"
-  }
+  },
+  "shellformat.flag": "-i 2 -ci"
 }

adr/2020-11-06-bash-style-guide.md

@@ -0,0 +1,15 @@
+Maurice:
+
+Seeing we have too many discussions around bash best practices we will settle for a style guide.
+I don't see a point in discussing which one to choose, only to choose one that is used by very big corporation/community.
+That is why I chose to start using this one:
+
+https://google.github.io/styleguide/shellguide.html
+
+Exceptions:
+
+- Keep file extensions for many reasons: easy for humans, ootb detection for most editors
+
+NOTE:
+
+Added flags to shell-format extension: "-i 2 -ci" to come close according to https://emacs.stackexchange.com/questions/32151/linter-for-google-shell-style-guide