CLI advanced lab description (#35)

* added cli advanced lab description

labs/advanced-labs/cli/README.md

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+# PiB CLI Customization
+
+PiB ships two CLIs (kic and flt) to make leaning and working with Kubernetes easier. Both CLIs can be customized on an organization, team, or app level. This workshop walks through the different customization options with examples.
+
+## This document is a work in progress
+
+## CLI Customization
+
+- There are 3 options that allow customization of the CLI
+  - Overriding built-in commands using bash scripts
+  - Adding / Removing commands using "boa config" files
+  - Modifying the source code
+