update README with a fancy screencast

Author: raidancampbell

README.md

@@ -6,6 +6,8 @@ A tool for capturing and organizing golang profiles
 2. (optional) copy this value into `$HOME/.config/pcabinet/pcabinet_config.yml` for the ability to run anywhere with `go install`
 2. `go run .` to start up the interface
 3. select your service from the presented list
-4. select the profile you'd like to capture from the presented list
+4. select the profile(s) you'd like to capture from the presented list
 5. (optional) give a description of what's different with this profile
 6. your profile is captured and stored into the `$NAME/$NAME.$DATE.$DESC.$TYPE` file
+
+![pcabinet](recording.gif?raw=true)