complete pest grammar and sample il file

test/data/test.il

@@ -1,11 +1,22 @@
 ;comment with some words
 
-(function1 arg1 arg2
-    (a b c)
-    cstyle( arg3)
+1
+1.3
+1e9
+3.5e-4
+"string"
+nil
+t
 
-    var1 = "string"
-    var2 = 1
-    var3 = nil
-    var4 = t
+token
+(list with items)
+'(lazy list)
+cstyle(list with args)
+
+var = arg1 + arg2 - " A" / 12
+obj->op()
+
+(let (a (b 3))
+    expr1
+    expr2
 )