Add tasks for all the new languages

Task/String-matching/Lingo/string-matching.lingo

@@ -0,0 +1,22 @@
+a = "Hello world!"
+b = "Hello"
+
+-- Determining if the first string starts with second string
+put a starts b
+-- 1
+
+-- Determining if the first string contains the second string at any location
+put a contains b
+-- 1
+
+-- Determining if the first string ends with the second string
+put a.char[a.length-b.length+1..a.length] = b
+-- 0
+
+b = "world!"
+put a.char[a.length-b.length+1..a.length] = b
+-- 1
+
+-- Print the location of the match for part 2
+put offset(b, a)
+-- 7