Add docs/SIMPLE_FUNCTIONS.md from Claro v1.17.26 zip

docs/SIMPLE_FUNCTIONS.md

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+# Simple Functions
+
+Claro teaches functions with plain words.
+
+Preferred beginner style:
+
+```claro
+TEACH greet name
+    SAY "Hello " + name
+END
+
+DO greet "Jon"
+```
+
+Older compatible style:
+
+```claro
+TEACH greet TAKES name
+    SAY "Hello " + name
+LEARNED
+
+CALL greet WITH "Jon"
+```