Issue template for Platform repo

closes #2691

File includes instructions for external users to report a bug or request a feature/enhancement.

issue_template.md

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+<!-- *Do you want to request a feature? -->
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+** Follow the example given to make a feature/enhancement request **
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+> Title: "Add a week selector in the date picker"
+Description: The date picker only allows to select a single day. It should be possible to select a range of 7 days
+User Story: "As an API owner, I need a week selector in the date picker, so that I can render the statistics for a selective 7 days."
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+
+<!-- *Do you want to report a bug? -->
+
+
+** Follow the example given to submit a bug report **
+
+> Title: Mandatory fields are not identifiable
+Steps to Reproduce: 1. go to page: https://....
+                    2. click Save button without filling the fields.
+Outcome: Page reloads and shows mandatory fields are needed to be filled in. No alert appears before page refresh.
+         [screenshot of GIF]
+Expected Behavior: Fields should indicate if they are mandatory with * sign. 
+                   Alert for related field should appear if they are left empty.
+                   Page reload should not be possible if mandatory fields are left empty.
+Environment: Windows 10, Chrome browser (latest), APInf production site (https://apinf.io)
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