Add README.md

Author: randomairborne

README.md

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+# expiringmap
+
+A rust library implementing a TTL map.
+
+```rust
+use std::time::Duration;
+use expiringmap::ExpiringMap;
+
+fn main() {
+    let mut map = ExpiringMap::new();
+    map.insert("key", "value", Duration::from_millis(50));
+    std::thread::sleep(Duration::from_millis(60));
+    assert!(map.get(&"key").is_none());
+}
+```