test: Add initial support for catch2

This will be used by future test cases in place of googletest.

Change-Id: I41bf1d4f85ebffd1353e6d33a8eaee49803cb254
Signed-off-by: William A. Kennington III <wak@google.com>
diff --git a/subprojects/Catch2.wrap b/subprojects/Catch2.wrap
new file mode 100644
index 0000000..ea8939c
--- /dev/null
+++ b/subprojects/Catch2.wrap
@@ -0,0 +1,3 @@
+[wrap-git]
+url = https://github.com/catchorg/Catch2
+revision = v2.11.1