Add section for "Call for Testing"

Author: Muscraft

draft/2022-05-18-this-week-in-rust.md

@@ -70,6 +70,14 @@ If you are a Rust project owner and are looking for contributors, please submit
 
 <!-- Perf results go here -->
 
+### Call For Testing
+
+An important step for RFC implementation is for people to experiment with the
+implementation and give feedback, especially before stabilization.  The following
+RFCs are at point where user testing is needed before moving forward:
+
+
+
 <!-- RFC and FCP sections go here -->
 
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