New Bitcoin Core subsite

This commit contains a large number of contributions from Saïvann
Carignan.

en/bitcoin-core/contribute/index.md

@@ -0,0 +1,40 @@
+---
+# This file is licensed under the MIT License (MIT) available on
+# http://opensource.org/licenses/MIT.
+
+layout: base-core
+lang: en
+id: bitcoin-core-contribute
+columns: 1
+title: Contribute to Bitcoin Core
+breadcrumbs:
+  - bitcoin
+  - bcc
+  - Contribute
+---
+# Contributing To Bitcoin Core
+
+Thank you for considering contributing to Bitcoin Core!  We have
+instructions below to help you get started contributing in several different
+ways.
+
+If want to contribute in another way, please visit the [#bitcoin-dev][]
+IRC chatroom and discuss your plan with a developer.
+
+<div markdown="block" class="two-column-list">
+
+{:.fa-ul}
+- <span class="fa fa-li fa-bug fa-2x"></span> **[Bug reports][bcc contribute issues]**<br>Report bugs, including security issues
+
+- <span class="fa fa-li fa-code fa-2x"></span> **[Code][bcc contribute code]**<br>Write & review code
+
+- <span class="fa fa-li fa-book fa-2x"></span> **[Documentation][bcc contribute documentation]**<br>Write documentation for users and developers
+
+- <span class="fa fa-li fa-language fa-2x"></span> **[Translations][bcc contribute translations]**<br>Translate the user interface
+
+- <span class="fa fa-li fa-question fa-2x"></span> **[Tech support][bcc contribute support]**<br>Support other users
+
+</div>
+<br class="clear"><br class="big">
+
+{% include references.md %}