tokei: add page (#2545)

pages/common/tokei.md

@@ -0,0 +1,19 @@
+# tokei
+
+> A program that prints out statistics about code.
+
+- Get a report on the code in a folder and all subfolders:
+
+`tokei {{path/to/folder}}`
+
+- Get a report for a folder excluding `.min.js` files:
+
+`tokei {{path/to/folder}} -e {{*.min.js}}`
+
+- Print out statistics for individual files in a folder:
+
+`tokei {{path/to/folder}} --files`
+
+- Get a report for all files of type Rust and Markdown:
+
+`tokei {{path/to/folder}} -t={{Rust}},{{Markdown}}`