Add tasks for all the new languages

Task/String-case/Lingo/string-case-1.lingo

@@ -0,0 +1,29 @@
+----------------------------------------
+-- Lower to upper case (ASCII only)
+-- @param {string} str
+-- @return {string}
+----------------------------------------
+on toUpper (str)
+  alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+  len = str.length
+  repeat with i = 1 to len
+    pos = offset(str.char[i], alphabet)
+    if pos > 0 then put alphabet.char[pos] into char i of str
+  end repeat
+  return str
+end
+
+----------------------------------------
+-- Upper to lower case (ASCII only)
+-- @param {string} str
+-- @return {string}
+----------------------------------------
+on toLower (str)
+  alphabet = "abcdefghijklmnopqrstuvwxyz"
+  len = str.length
+  repeat with i = 1 to len
+    pos = offset(str.char[i], alphabet)
+    if pos > 0 then put alphabet.char[pos] into char i of str
+  end repeat
+  return str
+end