Style: Unify formatting, add .editorconfig (#88)

.editorconfig

@@ -0,0 +1,23 @@
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+indent_size = 4
+indent_style = tab
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.{csproj,sln}]
+charset = utf-8-bom
+end_of_line = crlf
+
+[*.{cs,py}]
+indent_style = space
+
+[*.{csproj,yml,yaml}]
+indent_size = 2
+indent_style = space
+
+[*.md]
+trim_trailing_whitespace = false