chore: update README.md with a deprecated warning [skip-ci]

Author: softvar

README.md

@@ -1,4 +1,23 @@
-## VWO Node SDK
+# ⚠️ [DEPRECATED] VWO Node SDK
+
+------
+**⚠️ This project is no longer actively developed. ⚠️**
+
+**✅ We are only fixing critical bugs and security issues.**
+
+**❌ No new features, enhancements, or non-critical updates will be added.**
+
+#### Switch to *VWO Feature Management & Experimentation(FME)* – The Better Alternative! 🚀
+
+VWO’s FME product empowers teams to seamlessly test, release, optimize, and roll back features across their entire tech stack while minimizing risk and maximizing business impact.
+
+* Check out FME developer documentation [here](https://developers.vwo.com/v2/docs/fme-overview).
+* Check [this](https://developers.vwo.com/v2/docs/sdks-release-info ) for the list of all FME-supported SDKs.
+
+**💡 Need Help?**
+For migration assistance or any questions, contact us at [support@vwo.com](support@vwo.com)
+
+------
 
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