First stab at UPF overview

Change-Id: I86f311399b697f83bd568050256308c65445394e
diff --git a/.gitignore b/.gitignore
index 68c3e29..52e491f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,3 +2,4 @@
 _build
 .vscode
 .env
+.idea