add todos in readme

README.md

@@ -3,7 +3,7 @@
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-Simple Blockchain Implementation in Scala.
+A simplified Blockchain implementation in Scala based on the specifications of Bitcoin.
 
 *This project is still under development. APIs are not fully completed according to the cores.*
 
@@ -20,3 +20,12 @@ Start the service, run this Class:
 ```
 com.fluency03.blockchain.api.Server
 ```
+
+
+#### Todos
+
+- Complete APIs' Todos
+- Make states in actor persistent (using Akka Persistent)
+- Make data distributed within cluster of peer (using Akka Cluster)
+- Block propagation among peers
+- etc.