Add an editorconfig file, for extra help.

Author: rpavlik

.editorconfig

@@ -0,0 +1,21 @@
+# editorconfig.org
+
+# top-most EditorConfig file
+root = true
+
+# Default settings:
+# A newline ending every file
+# Use 2 spaces as indentation
+# Trim trailing whitespace
+[*]
+end_of_line = lf
+insert_final_newline = true
+indent_style = space
+indent_size = 2
+trim_trailing_whitespace = true
+
+[*.cs]
+indent_style = tab
+
+[*.csproj]
+indent_size = 2