Add .editorconfig file to pre-configure contributor IDEs

Author: colinodell

.editorconfig

@@ -0,0 +1,11 @@
+; top-most EditorConfig file
+root = true
+
+# All files.
+[*]
+end_of_line = LF
+indent_style = space
+indent_size = 4
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true

.gitattributes

@@ -2,6 +2,7 @@
 # https://www.kernel.org/pub/software/scm/git/docs/gitattributes.html
 
 # Ignore all test and documentation with "export-ignore".
+/.editorconfig        export-ignore
 /.gitattributes       export-ignore
 /.github              export-ignore
 /.gitignore           export-ignore