Spooky readme

README.md

@@ -1,3 +1,34 @@
 ![Spoooky!](https://github.com/jsannemo/spooky-vm/blob/master/spook.png?raw=true)
 
 So spooky.
+
+## Usage:
+```
+java --enable-preview spooky.jar compile source.spooky exec.spook
+java --enable-preview spooky.jar run exec.spook
+```
+
+## Example programs
+```scala
+extern printInt(i: Int)
+extern print(ch: Int)
+
+func isPrime(n: Int) -> Int {
+  p: Int = 1;
+  for (i: Int = 2; i * i <= n; i = i + 1) {
+    if (n % i == 0) {
+      return false;
+    }
+  }
+  return true;
+}
+
+func main() {
+  for (n: Int = 90; n < 100; n = n + 1) {
+    printInt(n);
+    print(32);
+    printInt(isPrime(n));
+    print(10);
+  }
+}
+```