update readme

supporting-docs/projects/README.md

@@ -1,4 +1,4 @@
 # Matrix Projects
-Feel free to send us a PR to add or update an entry. You can also add a screen shot and just refer to the git-hub URL of that image in the entry.
+Feel free to send us a PR to add or update an entry. You can use the [template](./template.md) and you can upload a thumbnail and/or a main picture to the [images](./images/) subfolder - these will be accessible from https://matrix.org/docs/projects/images/
 
-Jekyll requires a date in the filename; we use the date to sort the various project lists (newest projects first). It might be best to submit new entries with a date like 2015-01-01.
+Jekyll requires a date in the project filename; we use the date to sort the various project lists (newest projects first). It might be best to submit new entries with a date like 2015-01-01.