Add tasks for all the new languages

Task/Pangram-checker/Ring/pangram-checker.ring

@@ -0,0 +1,15 @@
+pangram = 0
+s = "The quick brown fox jumps over the lazy dog."
+see "" + pangram(s) + " " + s + nl
+
+s = "My dog has fleas."
+see "" + pangram(s) + " " + s + nl
+
+func pangram str
+     str  = lower(str)
+     for i = ascii("a") to ascii("z")
+             bool = substr(str, char(i)) > 0
+             pangram = pangram + bool
+     next
+     pan = (pangram = 26)
+     return pan