docs: add CHANGELOG.md, project breakdown in CONTRIBUTING.md (#248)

Co-authored-by: Avery Harnish <[email protected]>

Author: lrlna

CHANGELOG.md

@@ -0,0 +1,9 @@
+# Changelog
+
+All notable changes to Rover will be documented in this file.
+
+This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+# [0.0.1] - 2021-02-09
+
+**Initial beta release.** Please visit [our documentation page](apollographql.com/docs/rover/) for information on usage.

CONTRIBUTING.md

@@ -4,6 +4,77 @@
 > external feature contributors, though some documentation contributions may be 
 > accepted. 
 
+## Prerequisites 
+
+Rover is written in [Rust]. In order to contribute, you'll need to have
+Rust installed. To install Rust, visit [https://www.rust-lang.org/tools/install].
+
+Rust has a build tool and package manager called [`cargo`] that you'll use to 
+interact with Rover's code.
+
+To build the CLI:
+```bash
+cargo build
+```
+
+To run the CLI:
+```bash
+cargo run -- <args>
+# e.g. 'cargo run -- help' will run the rover help command
+```
+
+You can also install Rover to your local PATH from source with cargo by first
+cloning this repository, and then building the CLI:
+```bash
+cargo build
+```
+
+And then running cargo with `install` argument: 
+```bash
+cargo run -- install
+```
+
+[Rust]: https://www.rust-lang.org/
+[`cargo`]: https://doc.rust-lang.org/cargo/index.html
+[https://www.rust-lang.org/tools/install]: https://www.rust-lang.org/tools/install
+
+## Project Structure
+
+- `src`: the `rover` CLI
+    - `src/bin/rover.rs`: the entry point for the CLI executable
+    - `src/command`: logic for the CLI commands
+      - `src/command/output.rs`: Enum containing all possible `stdout` options for Rover commands
+    - `src/utils`: shared utility functions
+    - `src/error`: application-level error handling including suggestions and error codes
+    - `src/cli.rs`: Module containing definition for all top-level commands
+    - `src/lib.rs`: all the logic used by the CLI
+
+- `crates`
+    - `crates/houston`: logic related to configuring rover
+    - `crates/robot-panic`: Fork of robot-panic to create helpful panic handlers
+    - `crates/rover-client`: logic for querying apollo services
+    - `crates/sputnik`: logic for capturing anonymous usage data
+    - `crates/timber`: output formatting and logging logic
+
+
+## Documentation
+
+Documentation for using and contributing to rover is built using Gatsby and [Apollo's Docs Theme for Gatsby](https://github.com/apollographql/gatsby-theme-apollo/tree/master/packages/gatsby-theme-apollo-docs).
+
+To contribute to these docs, you can add or edit the markdown & MDX files in the `docs/source` directory.
+
+To build and run the documentation site locally, you'll have to install the relevant packages by doing the following from the root of the `rover` repository:
+
+```sh
+cd docs
+npm i
+npm start
+```
+
+This will start up a development server with live reload enabled. You can see the docs by opening [localhost:8000](http://localhost:8000) in your browser.
+
+To see how the sidebar is built and how pages are grouped and named, see [this section](https://github.com/apollographql/gatsby-theme-apollo/tree/master/packages/gatsby-theme-apollo-docs#sidebarcategories) of the gatsby-theme-apollo-docs docs. There is also a [creating pages section](https://github.com/apollographql/gatsby-theme-apollo/tree/master/packages/gatsby-theme-apollo-docs#creating-pages) if you're interesed in adding new pages.
+=======
 For info on how to contribute to Rover, see the [docs](https://go.apollo.dev/r/contributing).
 
 ## Code of Conduct
@@ -46,4 +117,4 @@ course *even if you are not entirely convinced you need to*. Giving other
 contributors the benefit of the doubt and having a sincere willingness to admit
 that you *might* be wrong is critical for any successful open collaboration.
 
-Don't be a bad actor.
+Don't be a bad actor.