Add a sign-up snippet

.github/CODEOWNERS

@@ -1,6 +1,9 @@
 # Code owners
 .github/CODEOWNERS      @exercism/maintainers-admin
 
+# The code sample shown in the code check when people sign up to Exercism
+docs/SIGN_UP_SNIPPET.txt    @exercism/maintainers-admin
+
 # Changes to `fetch-configlet` should be made in the `exercism/configlet` repo
 bin/fetch-configlet     @exercism/maintainers-admin
 

docs/SIGN_UP_SNIPPET.txt

@@ -0,0 +1,14 @@
+variable matches
+
+: count-word
+  0 matches !
+  2swap begin 2over search while
+    1 matches +!
+    1 /string
+  repeat
+  2drop 2drop matches @ ;
+
+: report
+  2dup 2>r count-word 2r>
+  [char] " emit type [char] " emit
+  ."  appears " . ." times" ;