Add cross-link to our "add logo instructions" in OurUsers.res

Author: ryyppy

src/common/OurUsers.res

@@ -1,5 +1,8 @@
 type company = Logo({name: string, url: string, path: string})
 
+// NOTE: More details on how this works can be found in our README:
+// https://github.com/rescript-association/rescript-lang.org#how-to-add-your-company-logo-to-our-front-page
+
 let companies = [
   Logo({
     name: "Juspay",