Add no-longer-maintained badge and note

README.md

@@ -1,8 +1,13 @@
 # filecoin.js
 
+![Project Status](https://img.shields.io/badge/status-No%20longer%20maintained-red?style=for-the-badge)
+[![GitHub last commit](https://img.shields.io/github/last-commit/filecoin-shipyard/filecoin.js?style=for-the-badge)](https://github.com/data-preservation-programs/spade/graphs/commit-activity)
+
 ## Status
 
-This repository is currently being updated and will be further updated to support the coming Filecoin VM. Learn more at [fvm.filecoin.io](https://fvm.filecoin.io)
+Unfortunately this project has not seen any meaningful activities since November 2020 and is deemed unmaintained. If you are a user of this project and would like to become a maintainer, please reach out to [@smagdali](https://github.com/smagdali).
+
+~~This repository is currently being updated and will be further updated to support the coming Filecoin VM. Learn more at [fvm.filecoin.io](https://fvm.filecoin.io)~~
 
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