Add more examples to README

README.md

@@ -2,7 +2,9 @@
 
 ## [Documentation](http://www.rust-ci.org/lucidd/rust-promise/doc/promise/)
 
-## Example
+## Examples
+
+### Basics
 
 ```rust
 extern crate promise;
@@ -17,3 +19,41 @@ fn main() {
     println!("end of main");
 }
 ```
+
+### Composing Futures
+
+```rust
+extern crate promise;
+
+use promise::Future;
+use std::time::duration::Duration;
+
+fn main() {
+    let hello = Future::delay(proc() "hello", Duration::seconds(3));
+    let world = Future::from_fn(proc() "world");
+    let hw = Future::all(vec![hello, world]);
+    hw.map(proc(f) format!("{} {}!", f[0], f[1]))
+      .on_success(proc(value){
+        println!("{}", value)
+    });
+    println!("end of main");
+}
+```
+
+```rust
+extern crate promise;
+
+use promise::Future;
+use std::time::duration::Duration;
+
+
+fn main() {
+    let timeout = Future::delay(proc() Err("timeout"), Duration::seconds(2));
+    let f = Future::delay(proc() Ok("hello world!"), Duration::seconds(3));
+    let hw = Future::first_of(vec![f, timeout]);
+    hw.on_success(proc(value){
+        println!("{}", value)
+    });
+    println!("end of main");
+}
+```