Add my bits of the April report

wiki/src/blueprint/monthly_report/report_2019_04.mdwn

@@ -102,6 +102,14 @@ Outreach
 Past events
 -----------
 
+- sajolida, moire, and emmapeel were at the [Internet Freedom
+  Festival](https://internetfreedomfestival.org/) on April 1–5 in
+  Valencia, Spain.
+
+  sajolida presented there a workshop on [Creating
+  usable tools from day one with paper
+  prototyping](https://platform.internetfreedomfestival.org/en/IFF2019/public/schedule/custom/975).
+
 - [carlosm2](https://twitter.com/dospesosinc) held 2 workshops about Tails in Mexico:
 
   - On [April 13](https://twitter.com/dospesosinc/status/1115675448753573888) at the Colima Hacklab