chore: add editorconfig for TypeScript projects (#40)

Author: CalvinAllen

.editorconfig

@@ -0,0 +1,21 @@
+root = true
+
+[*]
+indent_style = space
+indent_size = 2
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[*.{ts,tsx,js,jsx}]
+indent_size = 2
+
+[*.json]
+indent_size = 2
+
+[*.yml]
+indent_size = 2
+
+[*.md]
+trim_trailing_whitespace = false