Add tasks for all the new languages

Task/String-matching/Lasso/string-matching.lasso

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+local(
+ a = 'a quick brown peanut jumped over a quick brown fox',
+ b = 'a quick brown'
+)
+
+//Determining if the first string starts with second string
+#a->beginswith(#b) // true
+
+//Determining if the first string contains the second string at any location
+#a >> #b           // true
+#a->contains(#b)   // true
+
+//Determining if the first string ends with the second string
+#a->endswith(#b)   // false