Draft of <README.MD> for NPM (plume-sig#103)

I believe these should be organized other way (divide the monorepo?). But @Divide-By-0 seems to really need something to start with rn

javascript/README.MD

@@ -0,0 +1,20 @@
+JavaScript implementation of the PLUME signature scheme.
+
+## API
+### sign(message, privateKey)
+Signs a message using the provided private key.
+* `message` - String message to sign
+* `privateKey` - Hex private key
+
+Returns the PLUME signature.
+
+### `verify(message, publicKey, signature)`
+Verifies a signature matches the message and public key.
+* `message` - Original string message
+* `publicKey` - Hex public key
+* `signature` - PLUME signature
+
+Returns true if the signature is valid, false otherwise.
+
+### License
+MIT