Added usage examples

README.md

@@ -1,2 +1,29 @@
 # bullet
 [![Go Report Card](https://goreportcard.com/badge/github.com/pczajkowski/bullet)](https://goreportcard.com/report/github.com/pczajkowski/bullet)
+
+**Initialize client**
+
+	b := bullet.NewBullet("YOUR_TOKEN")
+
+**Send note**
+
+	err := b.SendNote("testTitle", "testText")
+	if err != nil {
+		log.Fatal(err)
+	}
+
+**Send link**
+
+	err := b.SendLink("testTitle", "testText", "https://abc.com")
+	if err != nil {
+		log.Fatal(err)
+	}
+
+**Send file**
+
+	err := b.SendFile("testFile", "Something", "./test.txt")
+	if err != nil {
+		log.Fatal(err)
+	}
+
+