link to the different variants in README

Author: angelo-v

bookmarks/README.md

@@ -5,13 +5,13 @@ Implemented conventions
 
 ## Usage
 To use the Bookmarks data module, first decide if you want to use it on top of:
-* @inrupt/solid-client
-* rdflib-js (not implemented yet)
-* soukai
+* [@inrupt/solid-client](./vanilla)
+* [rdflib](./rdflib)
+* [soukai](./soukai)
 * LDO (not implemented yet)
 
 See the applicable subfolder
 
 * If you're using `@inrupt/solid-client` you should pick `bookmarks/vanilla`.
 * If you're using `soukai-solid` go ahead and pick `bookmarks/soukai`.
-* as a rule of thumb, if you're new to solid and don't know which one to choose, pick the vanilla one.
+* as a rule of thumb, if you're new to solid and don't know which one to choose, pick the vanilla one.