Add introductory text for bigbone.social

docs/index.md

@@ -15,4 +15,15 @@ A Mastodon Client Library for Java and Kotlin
 
 ---
 
-To be written.
+# Welcome to BigBone!
+
+Whether you're a seasoned developer or just starting out, our library provides a reliable and efficient solution for 
+tapping into Mastodon's feature-rich API.
+
+With BigBone, you can seamlessly build applications that utilize Mastodon's functionalities, from fetching timelines 
+and notifications to posting updates and interacting with users. Our user-friendly API allows you to focus on crafting 
+your application's unique user experience without getting bogged down in the complexities of Mastodon's API.
+
+Whether you're creating a desktop client, a mobile app, or a unique Mastodon-powered service, BigBone empowers you to 
+bring your ideas to life. Join the BigBone community today and start building the next generation of Mastodon 
+applications!