Added Readme

README.md

@@ -0,0 +1,50 @@
+# Rust Discord Activity
+_A lightweight library developed in Rust to control Discord Rich Presence_
+
+## How-to
+Three steps:
+1. Create your Activity and set desired data using provided structs 
+2. Create a new Payload with your Activity
+3. Instantiate a new DiscordClient and send your Payload through it
+
+Et voilà !
+
+## Example
+```rust
+let mut activity = Activity::new();
+
+let limg = Some(String::from("https://placehold.co/600x400/png"));
+let simg = Some(String::from("https://placehold.co/600x400/png"));
+let asset = Asset::new(limg, None, simg, None);
+let now_in_millis = SystemTime::now().duration_since(UNIX_EPOCH).unwrap().as_millis();
+let timestamp = Timestamp::new(Some(now_in_millis - 10000), None);
+
+let party = Party::new(None, Some((2, 4)));
+let mut button_vec = vec![];
+button_vec.push(Button::new("First Button".into(), "https://google.com".into()));
+button_vec.push(Button::new("Second Button".into(), "https://yahoo.com".into()));
+
+activity
+.set_state(Some("This is State".into()))
+.set_activity_type(Some(ActivityType::LISTENING))
+.set_details(Some("This is Details".parse().unwrap()))
+.set_timestamps(Some(timestamp))
+.set_assets(Some(asset))
+.set_party(Some(party))
+.set_instance(Some(true))
+.set_buttons(Some(button_vec));
+
+let payload = Payload::new(EventName::Activity, EventData::Activity(activity));
+
+let mut client = DiscordClient::new("<application_id>");
+let _ = client.send_payload(payload);
+
+```
+
+And voilà! This sets-up a new Activity for the current Discord user:
+![Discord Rich Presence](https://imgur.com/gf9pOen.png)
+
+## Next Steps
+- Write the documentation for this library
+- Write unit tests
+- Push the library on crates.io