msh: create testsuite (based on hush one)
hush: add TODO (doesn't know ":" command)

diff --git a/shell/msh_test/msh-parsing/quote1.tests b/shell/msh_test/msh-parsing/quote1.tests
new file mode 100755
index 0000000..f558954
--- /dev/null
+++ b/shell/msh_test/msh-parsing/quote1.tests
@@ -0,0 +1,2 @@
+a=1
+echo "'$a'"