conlang: Add break, true, false keywords, and example file

dummy.cl

@@ -1,9 +1,24 @@
-#!/ this is a shebang comment!
-// This is an example Conlang file.
+#!/usr/local/bin/conlang
+// This is a Conlang file. Conlang is an expression-based language designed for maximum flexibility etc. etc. whatever
 
-/* Conlang supports block comments! */
-ident  // Identifier
-.1     // literal float
-0.1    // literal float
-0x1234 // literal integer
-"str"  // literal string
+// This is a function. It can be called with the call operator.
+// The function called `main` is the program's entrypoint
+fn main() {
+    let x = 100;
+
+    // An if expression is like the ternary conditional operator in C
+    let y = if x < 50 {
+        0
+    } else {
+        x
+    };
+    
+    // A `for` expression is like the for-else construct in Python, but it returns a value via the `break` keyword
+    let z = for i in 0..y {
+        // do a thing repeatedly
+        break true
+    } else {
+        false
+    };
+    // TODO: decide how to do IO
+}