Docs: Add how to add TASH command

There are already two READMEs in own foldders. To know it easily, add a new document at docs folder and give a link.
dmoons · Nov 3, 2017 · ecdd987 · ecdd987
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+# How to add TASH command
+
+There are two methods to register TASH command, using public APIs and using built-in functionality.  
+Please use one among them.
+
+## Using Public APIs
+
+Please find it at [README](../apps/shell/README.md#how-to-register-a-command-on-tash) of shell.
+
+## Using Built-in Functionality
+
+Please find it at [README](../apps/builtin/README.md) of built-in.  
+But limitation of built-in is working it only in apps folder.