Update issue templates

.github/ISSUE_TEMPLATE/app-request.md

@@ -0,0 +1,13 @@
+---
+name: App request
+about: Suggest an app to be added to Pi-Apps (not an app submission)
+title: ''
+labels: App Request
+assignees: ''
+
+---
+
+Criteria:
+[ ] Can this app already run well on RPi?
+[ ] Is this app something many GUI users would find useful?
+[ ] Is this app installable with `sudo apt install`?

.github/ISSUE_TEMPLATE/suggestion.md

@@ -0,0 +1,10 @@
+---
+name: Suggestion
+about: Have an idea for Pi-Apps and it's not a bug or app request?
+title: ''
+labels: suggestion
+assignees: ''
+
+---
+
+