Site Docs: Stregthen Appeal For Volunteers In README

This suggests specific tasks for new volunteers and links directly to
relevant pages or README sections.

We also advise submitters of new wallets to read the requirements list.

README.md

@@ -1,6 +1,58 @@
 ## How To Participate
 
-You can report problems or help improve bitcoin.org by opening an issue or a [pull request](#working-with-github) on [GitHub](https://github.com/bitcoin/bitcoin.org). You can also help by [translating](#translation) bitcoin.org's text on [Transifex](https://www.transifex.com/projects/p/bitcoinorg/).
+*Bitcoin.org needs volunteers like you!*  Here are some ways you can help:
+
+* "Watch" this repository to be notified of issues and Pull Requests
+  (PRs) that could use your attention. Scroll to the top of this page
+  and click the *Watch* button to get notifications by email and on your
+  GitHub home page.
+
+    Alternatively, email volunteer coordinator Dave Harding
+    <dave@dtrt.org> with a short list of your interests and skills, and
+    he'll email you when there's an issue or PR that could use your
+    attention.
+
+* Help [write new documentation][] for the [developer
+  documentation pages][] or [upcoming full node page][], or **review [PRs
+  adding new documentation][].** You don't need to be a Bitcoin expert
+  to review a PR---these docs are written for non-experts, so we need to
+  know if non-experts find them confusing or incomplete. If you review a
+  PR and don't find any problems worth commenting about, leave a "Looks
+  Good To Me (LGTM)" comment.
+
+* [Submit new wallets][] for the [Choose Your Wallet page][], or
+  help us [review wallet submissions][]. **Reviewers with Apple iOS
+  hardware especially needed**---email <dave@dtrt.org> to
+  be notified about iOS wallets needing review.
+
+* [Translate Bitcoin.org into another language][] using [Transifex][] or
+  help review new and updated translations. **Translation coordinator
+  needed** to answer translator questions and help process
+  reviews---email <dave@dtrt.org> for details.
+
+* Help improve Bitcoin.org using your unique skills. We can always use
+  the help of writers, editors, graphic artists, web designers, and anyone
+  else to enhance Bitcoin.org's [current content][] or to add new
+  content. See the **list of [recommended starter projects][]** or email
+  volunteer coordinator Dave Harding <dave@dtrt.org> to start a
+  conversation about how you can help Bitcoin.org.
+
+You can always report problems or help improve bitcoin.org by opening a [new issue][] or [pull request][] on [GitHub][].
+
+[choose your wallet page]: https://bitcoin.org/en/choose-your-wallet
+[current content]: https://bitcoin.org/
+[developer documentation pages]: https://bitcoin.org/en/developer-documentation
+[GitHub]: https://github.com/bitcoin/bitcoin.org
+[new issue]: https://github.com/bitcoin/bitcoin.org/issues/new
+[PRs adding new documentation]: https://github.com/bitcoin/bitcoin.org/pulls?q=is%3Aopen+label%3A%22Dev+Docs%22+is%3Apr
+[pull request]: #working-with-github
+[recommended starter projects]: https://github.com/bitcoin/bitcoin.org/wiki/Starter-Projects
+[review wallet submissions]: https://github.com/bitcoin/bitcoin.org/pulls?q=is%3Aopen+label%3Awallet+is%3Apr
+[submit new wallets]: #adding-a-wallet
+[transifex]: https://www.transifex.com/projects/p/bitcoinorg/
+[translate Bitcoin.org into another language]: #how-to-translate
+[upcoming full node page]: https://github.com/bitcoin/bitcoin.org/pull/711
+[write new documentation]: #developer-documentation
 
 ### Working With GitHub
 
@@ -316,6 +368,11 @@ Optional criterias (some could become requirements):
 
 ### Adding a wallet
 
+*Before adding a wallet,* please make sure your wallet meets all of the
+Basic Requirements listed above, or open a [new issue][] to request an
+exemption or policy change. Feel free to email Dave Harding
+<dave@dtrt.org> if you have any questions.
+
 Wallets can be added in `_templates/choose-your-wallet.html`. Entries are ordered by levels and new wallets must be added after the last wallet on the same level.
 
 * Level 1 - Full nodes