sample-code: Add some sample Conlang programs :D

sample-code/fizzbuzz.cl

@@ -0,0 +1,20 @@
+// FizzBuzz, using the unstable variadic-`print` builtin
+
+fn main() {
+    fizz_buzz(10, 20)
+}
+
+// Outputs FizzBuzz for numbers between `start` and `end`, inclusive
+fn fizz_buzz(start: i128, end: i128) {
+    for x in start..=end {
+        print(if x % 15 == 0 {
+            "FizzBuzz"
+        } else if 0 == x % 3 {
+            "Fizz"
+        } else if x % 5 == 0 {
+            "Buzz"
+        } else {
+            x
+        })
+    }
+}