Add integrations to README, aptly API CLI. [ci skip]

README.rst

@@ -78,4 +78,29 @@ should work as well, but might fail or produce different result (if external lib
 
 If you don't have Go installed (or older version), you can easily install Go using `gvm <https://github.com/moovweb/gvm/>`_.
 
+Integrations
+------------
 
+Vagrant:
+
+-   [Vagrant configuration](https://github.com/sepulworld/aptly-vagrant) by
+    Zane Williamson, allowing to bring two virtual servers, one with aptly installed
+    and another one set up to install packages from repository published by aptly
+
+Docker:
+
+-    [Docker container](https://github.com/mikepurvis/aptly-docker) with aptly inside by Mike Purvis
+
+With configuration management systems:
+
+-   [Chef cookbook](https://github.com/hw-cookbooks/aptly) by Aaron Baer
+    (Heavy Water Operations, LLC)
+-   [Puppet module](https://github.com/alphagov/puppet-aptly) by
+    Government Digital Services
+-   [SaltStack Formula](https://github.com/saltstack-formulas/aptly-formula) by
+    Forrest Alvarez and Brian Jackson
+-   [Ansible role](https://github.com/aioue/ansible-role-aptly) by Tom Paine
+
+CLI for aptly API:
+
+-   [Ruby aptly CLI/library](https://github.com/sepulworld/aptly_cli) by Zane Williamson