Add .editorconfig file to assist with maintaining consistent coding style

- Marked the .editconfig as root to stop further file searching.
- Added default charset, EOL, EOF and trailing whitespace rules.
- Set indent style and size for common file types (PHP, JS, HTML, SCSS, JSON).
- Added a commit message ruleset to prevent going over 72 characters.

Signed-off-by: Dillon-Brown <dillon.brown@salesagility.com>

.editorconfig

@@ -0,0 +1,24 @@
+; top-most EditorConfig file
+root = true
+
+; Unix-style newlines
+[*]
+charset = utf-8
+end_of_line = LF
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.{php, html, ts}]
+indent_style = space
+indent_size = 4
+
+[*.{js, json, scss}]
+indent_style = space
+indent_size = 2
+
+[*.md]
+max_line_length = off
+trim_trailing_whitespace = false
+
+[COMMIT_EDITMSG]
+max_line_length = 72