Add .editorconfig to specify preferred style

http://editorconfig.org/
diff --git a/.editorconfig b/.editorconfig
new file mode 100644
index 0000000..2655ebc
--- /dev/null
+++ b/.editorconfig
@@ -0,0 +1,16 @@
+# EditorConfig is awesome: http://EditorConfig.org
+
+# top-most EditorConfig file
+root = true
+
+# All files
+[*]
+end_of_line = lf
+insert_final_newline = true
+charset = utf-8
+trim_trailing_whitespace = true
+
+# Golang
+[*.go]
+indent_style = tab
+indent_size = 2