anagram: Add an example for list of strings

This is a second example that will fully test (using the proposal #395)
that the new tests in #393 correctly accept multiple signatures.

This is simply the old example before #395 changed it from acting on
`[String]` to `Set Text`

exercises/anagram/examples/list-string/Anagram.hs

@@ -0,0 +1,10 @@
+module Anagram (anagramsFor) where
+import Data.List (sort)
+import Data.Char (toLower)
+
+anagramsFor :: String -> [String] -> [String]
+anagramsFor word = filter (isAnagram . normalize)
+  where
+    normalize xs = let nxs = map toLower xs in (nxs, sort nxs)
+    (nw, sw) = normalize word
+    isAnagram (w, s) = nw /= w && sw == s

exercises/anagram/examples/list-string/package.yaml

@@ -0,0 +1,17 @@
+name: anagram
+
+dependencies:
+  - base
+
+library:
+  exposed-modules: Anagram
+  source-dirs: src
+  dependencies:
+
+tests:
+  test:
+    main: Tests.hs
+    source-dirs: test
+    dependencies:
+      - anagram
+      - hspec