Re-add issues submission section

topics/single-cell/metadata.yaml

@@ -2,7 +2,10 @@
 name: single-cell
 type: use
 title: Single Cell
-summary: Training material and practicals for all kinds of single cell analysis (particularly scRNA-seq!). When you generate your lovely gene lists for your cells, consider checking out our Transcriptomics tutorials for further network analysis!
+summary: |
+  Training material and practicals for all kinds of single cell analysis (particularly scRNA-seq!). When you generate your lovely gene lists for your cells, consider checking out our Transcriptomics tutorials for further network analysis!
+  
+  What else do you want to see? You can submit tool and/or tutorial requests through an Issue, as well as up-vote requests from others at our [Single Cell Community Tool Request Site](https://github.com/nomadscientist/single-cell-galaxy/issues).
 #docker_image: "quay.io/galaxy/transcriptomics-training"
 
 requirements: