Update issue templates

Included new issue template for suggestions.

Author: agarcialeon

.github/ISSUE_TEMPLATE/suggestion.md

@@ -0,0 +1,17 @@
+---
+name: Suggestion
+about: Suggest an idea to improve the content of the list.
+title: "[Suggestion] - Short description"
+labels: good first issue, suggestion
+assignees: agarcialeon
+
+---
+
+**Describe your suggestion:**
+_
+
+**Indicate how it can improve the content in the list:**
+_
+
+**Describe alternatives you've considered (if applicable)**
+_