docs: Create index.md

Author: hyperupcall

docs/index.md

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+# bash-object
+
+Manipulate heterogenous data hierarchies in Bash
+
+## Contents
+
+What are you doing here? Looking at documentation for this crazy library? :tongue_sticking_out:
+
+Unfortunately, you won't find any Getting Started guides, but you'll find some other things:
+
+- The [Motivation](docs/motivation.md) for building this library
+- The [Interfaces](docs/interface.md) for generating and modifcying objects
+- The syntax for making [Queries](docs/query.md) into objects
+- A short [Reference](docs/reference.md) containing some relevant environment variables