Added groovy script solution to problem one.

Author: tcoupland

teams/tc-groovy/src/BrisFunctional/Problem1.groovy

@@ -0,0 +1,4 @@
+def findMultiplesUnderLimit = {limit ->
+    (1..<limit).sum {it%3==0||it%5==0?it:0}
+}
+assert findMultiplesUnderLimit(10) == 23