Add tempates for new issues and pull requests.

Signed-off-by: David Calavera <david.calavera@gmail.com>

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,23 @@
+<!--
+Please make sure you've read and understood our contributing guidelines;
+https://github.com/docker/docker/blob/master/CONTRIBUTING.md
+
+** Make sure all your commits include a signature generated with `git commit -s` **
+
+For additional information on our contributing process, read our contributing
+guide https://docs.docker.com/opensource/code/
+
+If this is a bug fix, make sure your description includes "fixes #xxxx", or
+"closes #xxxx"
+-->
+
+Please provide the following information:
+
+- What did you do?
+
+- How did you do it?
+
+- How do I see it or verify it?
+
+- A picture of a cute animal (not mandatory but encouraged)
+