samples: add Terra samples

source: https://github.com/zdevito/terra/tree/master/tests

samples/Terra/quoteenv.t

@@ -0,0 +1,25 @@
+--quotes, unlike functions bind symbols eagerly
+--function have :compile() to bind their symbols, but no similar thing exists
+--for quotes, making it hard to control
+--furthermore there aren't many use cases for late-binding quotes,
+--but a bunch exist for needing early-bound quotes, like below:
+
+
+function times5(x)
+	local c = `0
+	for i = 1,5 do
+		c = `c + x
+	end
+	return c
+end
+times5 = macro(times5)
+
+terra foo()
+	var a  =  3
+	return times5(a)
+end
+
+foo:printpretty()
+foo:disas()
+local test = require("test")
+test.eq(foo(),15)