Add an EditorConfig file.

.editorconfig

@@ -0,0 +1,22 @@
+[*]
+charset = utf-8
+end_of_line = lf
+indent_style = tab
+indent_size = 8
+tab_width = 8
+
+# Disabled for now since not all editors support setting a tab_width value different from indent_size
+# Relevant VSCode extension issue: https://github.com/editorconfig/editorconfig-vscode/issues/190
+# [*.rc]
+# indent_style = space
+# indent_size = 4
+# tab_width = 8
+
+# [Makefile.*]
+# indent_style = space
+# indent_size = 4
+# tab_width = 8
+
+[*.manifest]
+indent_style = space
+indent_size = 2