Basic content repo outline.

Code's here, no tooling to generate content packs yet, however.

.editorconfig

@@ -0,0 +1,11 @@
+root = true
+
+[*]
+insert_final_newline = true
+indent_style = space
+indent_size = 4
+trim_trailing_whitespace = true
+charset = utf-8-bom
+
+[*.{csproj,xml,yml,dll.config,msbuildproj,targets}]
+indent_size = 2