updated README to add in installation notes.

README.md

@@ -6,5 +6,12 @@ For example, the SDK can communicate with the Kin Blockchain on behalf of the cl
 It can also monitor blockchain transactions so that you can implement broader services. 
 It is up to you how to integrate the SDK in your overall architecture and how to manage your server.
 
+# Installation Notes
+If you encounter an error while performing `npm install` with the error below, then you will need to downgrade you Node version to 11. Node >= 12 removed some functions that the `ed25519` library
+
+```
+../src/ed25519.cc:19:89: error: no matching member function for call to 'ToObject'
+        if ((info.Length() < 1) || (!Buffer::HasInstance(info[0])) || (Buffer::Length(info[0]->ToObject()) != 32)) {
+```
 
 <a href="https://kinecosystem.github.io/kin-website-docs/docs/documentation/nodejs-sdk"><img src="https://partners.kinecosystem.com/img/documentation-button2x.png" width=300 height=84 alt="Documentation"/></a>