chore: エディタとBiome設定の統一

Author: Ojoxux

.editorconfig

@@ -0,0 +1,24 @@
+# EditorConfig is awesome: https://EditorConfig.org
+
+# top-most EditorConfig file
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+indent_style = space
+indent_size = 3
+
+[*.md]
+trim_trailing_whitespace = false
+
+[*.{json,jsonc}]
+indent_size = 3
+
+[*.{yml,yaml}]
+indent_size = 2
+
+[Makefile]
+indent_style = tab