Update 'README.md'

README.md

@@ -59,6 +59,10 @@ but also in the home.
 * human-friendly
 * machine-friendly
 * no developer required
+
+### OAuth2 compatibility
+
+For compatibility with OAuth2 the `access_token` and `refresh_token` urls will be defined, but they are not defined presently.
 # Implementation Details
 OAuth3 is intended to work in URL-based flows such as `https://`, `app://`, and (ostensibly) `dat://`.
 
@@ -349,4 +353,6 @@ https://azp.tld/.well-known/oauth3/callback.html#/
   &scope=<<token.scp>>
   &state=<<params.state>>
   &debug=false
-```
+```
+
+## OAuth3 Token Issuance, Endpoints, and Process