Add mascot images as resources

I18n team now has official mascot - Parrot!
Logo files are needed to be managed by a repository
to make them useful for future usage such as incorporating
into translation platform dashboard (i.e., translate.o.o).

Change-Id: I2bed3e09c1c62aa411050e5777ccf134227ede32

resources/mascot/LICENSE

@@ -0,0 +1,6 @@
+Logos are licensed under the Creative Commons CC-BY-ND, similar to other
+Foundation materials.
+That means you can use them freely, but can’t make derivative work, such
+as adding a for-profit company’s logo into your community project’s logo.
+
+- More information: https://www.openstack.org/project-mascots/