Update examples

examples/hello.py

@@ -0,0 +1,16 @@
+"""This example demonstrates a basic API usage"""
+
+from pyrogram import Client
+
+# Create a new Client instance
+app = Client("my_account")
+
+with app:
+    # Send a message, Markdown is enabled by default
+    app.send_message("me", "Hi there! I'm using **Pyrogram**")
+
+    # Send a location
+    app.send_location("me", 51.500729, -0.124583)
+
+    # Send a sticker
+    app.send_sticker("me", "CAADBAADhw4AAvLQYAHICbZ5SUs_jwI")