guide: Add a contributing section and move DESIGN.md under it

Also adds a team section where we enumerate the folks on the `wasm-bindgen` team
and who can review pull requests

guide/src/SUMMARY.md

@@ -10,3 +10,9 @@
 - [Closures](./closures.md)
 - [Feature Reference](./feature-reference.md)
 - [CLI Reference](./cli-reference.md)
+
+--------------------------------------------------------------------------------
+
+- [Contributing](./contributing.md)
+  - [Design](./design.md)
+  - [Team](./team.md)

guide/src/contributing.md

@@ -0,0 +1,43 @@
+# Contributing to `wasm-bindgen`
+
+This section contains instructions on how to get this project up and running for
+development.
+
+## Prerequisites
+
+1. Rust Nightly. [Install Rust]. Once Rust is installed, run
+
+    ```shell
+    rustup default nightly
+    ```
+
+[install Rust]: https://www.rust-lang.org/en-US/install.html
+
+2. The tests for this project use Node. Make sure you have node >= 8 installed,
+   as that is when WebAssembly support was introduced. [Install Node].
+
+[Install Node]: https://nodejs.org/en/
+
+3. The tests for this project also use `yarn`, a package manager for Node. To
+   install `yarn`, run:
+
+    ```shell
+    npm install -g yarn
+    ```
+
+   or follow other platform-specific instructions
+   [here](https://yarnpkg.com/en/docs/install).
+
+   Once `yarn` is installed, run it in the top level directory:
+
+   ```shell
+   yarn
+   ```
+
+## Running Tests
+
+Finally, you can run the tests with `cargo`:
+
+```shell
+cargo test
+```

guide/src/introduction.md

@@ -28,7 +28,7 @@ welcome! If you're curious about the design plus even more information about
 what this crate can do, check out the [design doc].
 
 [host]: https://github.com/WebAssembly/host-bindings
-[design doc]: https://github.com/rustwasm/wasm-bindgen/blob/master/DESIGN.md
+[design doc]: https://rustwasm.github.io/wasm-bindgen/design.html
 [dom-ex]: https://github.com/rustwasm/wasm-bindgen/tree/master/examples/dom
 [console-log]: https://github.com/rustwasm/wasm-bindgen/tree/master/examples/console_log
 [perf-ex]: https://github.com/rustwasm/wasm-bindgen/tree/master/examples/performance

guide/src/team.md

@@ -0,0 +1,30 @@
+# Team
+
+`wasm-bindgen` follows the [`rustwasm` organization's governance described
+here][governance]:
+
+* All pull requests (including those made by a team member) must be approved by
+  at least one other team member.
+
+* Larger, more nuanced decisions about design, architecture, breaking changes,
+  trade offs, etc are made by team consensus.
+
+[governance]: https://github.com/rustwasm/team/blob/master/GOVERNANCE.md#repositories
+
+## Members
+
+<style>
+img {
+    max-width: 117px;
+    max-height: 117px;
+}
+</style>
+
+| [![](https://github.com/alexcrichton.png?size=117)][alexcrichton] | [![](https://github.com/fitzgen.png?size=117)][fitzgen] | [![](https://github.com/spastorino.png?size=117)][spastorino] | [![](https://github.com/ohanar.png?size=117)][ohanar] |
+|:---:|:---:|:---:|:---:|
+| [`alexcrichton`][alexcrichton] | [`fitzgen`][fitzgen] | [`spastorino`][spastorino] | [`ohanar`][ohanar] |
+
+[alexcrichton]: https://github.com/alexcrichton
+[fitzgen]: https://github.com/fitzgen
+[spastorino]: https://github.com/spastorino
+[ohanar]: https://github.com/ohanar