fix: add .editorconfig to fix error due to line endings on Windows (#5292)

Added editor config file to ensure that line endings are the same
regardless of the OS (This was causing problems for Windows + Docker)

## Steps for reproduction (Windows)

1. Clone webstudion builder and open with vs code, docker, etc.
2. every single file will have a git status of "m" (modified) due to
changed line endings

## Code Review

 hi @kof, I need you to take a look and make sure this is an ideal fix

It seems to work great on my end.

.editorconfig

@@ -0,0 +1,4 @@
+root = true
+
+[*]
+end_of_line = lf