Merge pull request 'editorconfig' (!55) from editorconfig into main

Reviewed-on: #55
Reviewed-by: Oystein Kristoffer Tveit <oysteikt@pvv.ntnu.no>

.editorconfig

@@ -0,0 +1,10 @@
+root = true
+
+[*]
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.nix]
+indent_style = space
+indent_size = 2

.git-blame-ignore-revs

@@ -0,0 +1 @@
+e00008da1afe0d760badd34bbeddff36bb08c475

shell.nix

@@ -5,6 +5,7 @@ pkgs.mkShellNoCC {
     gnupg
     statix
     openstackclient
+    editorconfig-checker
   ];
 
   shellHook = ''