Establish editorconfig; git ignore tgz files

.editorconfig

@@ -0,0 +1,15 @@
+# See https://editorconfig.org
+
+# top-most editorconfig file
+root = true
+
+# Apply these settings to all files
+[*]
+end_of_line              = lf
+indent_size              = 2
+indent_style             = space
+insert_final_newline     = true
+trim_trailing_whitespace = true
+
+[*.md]
+max_line_length          = 70

.gitignore

@@ -1,2 +1,3 @@
 node_modules
 save
+*.tgz