Add contribution docs

.editorconfig

@@ -0,0 +1,21 @@
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+indent_size = 2
+indent_style = space
+insert_final_newline = true
+max_line_length = 100
+tab_width = 2
+trim_trailing_whitespace = true
+
+[*.md]
+max_line_length = 0
+trim_trailing_whitespace = false
+
+[*.yml]
+max_line_length = 0
+
+[COMMIT_EDITMSG]
+max_line_length = 0