docs: Update Readme to provide some context. (#29)

Author: varungandhi-src

cmd/Readme.md

@@ -1,4 +1,21 @@
-# Semantic Code Intelligence Protocol (SCIP)
+# SCIP Code Intelligence Protocol
+
+SCIP (pronounciation: "skip") is a language-agnostic protocol
+for indexing source code,
+which can be used to power code navigation functionality
+such as Go to Definition, Find References, and Find Implementations.
+
+This repository includes:
+
+- A [protobuf schema for SCIP](./scip.proto).
+- Rich Go bindings for SCIP: This includes many utility functions
+  to help build tooling on top of SCIP.
+- Auto-generated bindings for TypeScript, Rust and Haskell.
+- The [`scip` CLI](#scip-cli-reference) makes SCIP indexes
+  a breeze to work with.
+
+<!-- TODO: Link to announcement blog post for "Why SCIP?"
+     or copy content from it here once the post is ready. -->
 
 <!--
 Workaround: This file is under cmd/ and symlinked from the root
@@ -37,6 +54,9 @@ The 'convert' subcommand currently only supports conversion from SCIP to LSIF.
 
 ## Contributing
 
-See [Development.md](./Development.md).
+We welcome questions, suggestions as well as code and docs contributions.
+
+For submitting contributions, check out [Development.md](./Development.md)
+to better understand project structure and common workflows.
 
 Contributors should abide by the [Sourcegraph Code of Conduct](https://handbook.sourcegraph.com/company-info-and-process/communication/code_of_conduct/).