Add first pass of a Support Us page

docs/get-involved/support.md

@@ -0,0 +1,25 @@
+---
+title: "Support Us"
+---
+
+If you like what you see whilst browsing Co-op Cloud and would like to
+contribute financially, as opposed to with code, we currently receive donations
+via an [Open Collective account](https://opencollective.com/coop-cloud).
+
+<div class="grid cards" markdown>
+
+- __Infrastructure Support__
+
+    If you make use of our digital infrastructure and want to help out with
+    maintenance costs, we wold be grateful :heart:
+
+    [Donate Now](https://opencollective.com/coop-cloud/contribute/infrastructure-sustainability-29878/checkout){ .md-button .md-button--primary }
+
+- __Joining Federation__
+
+    If you want to be more actively involved as a supporter, consider joining
+    our Federation :handshake_tone2:
+
+    [Learn More](/federation/){ .md-button .md-button--primary }
+
+</div>