Add generate-test-ca script

.gitignore

@@ -2,3 +2,5 @@
 /.build
 /Packages
 /*.xcodeproj
+test-ca.crt
+test-ca.key

generate-test-ca.sh

@@ -0,0 +1,7 @@
+#!/bin/bash
+
+# This can be useful for testing the install-ca command
+
+openssl genrsa -out test-ca.key 4096
+openssl req -x509 -new -nodes -key test-ca.key -sha256 -days 1024 -out test-ca.crt
+