samples: add Terra samples

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

samples/Terra/exampleparser1.t

@@ -0,0 +1,22 @@
+import "lib.exampleparser"
+
+P exp -1 + 1 * (2 - 3)
+P exp not true or false and 3
+P exp a.b.c[d]()(a,b,c)
+P exp (a + 3)(4)
+P exp {a,3,4, d = 4, [1+3] = 3}
+P exp [ 3 + 4 ]
+P statement var a,b,c:int = 3
+P statement do
+    if a then b else c end
+    if a then b end
+    if a then b elseif c then d end
+    while 3 + 3 do end
+    repeat
+    until a + b
+    for a,b,c:int = 1,3 do end
+    for a,b,c:int in 1,3 do end
+    a = b
+    a
+    a,c = d,e
+end