Adding Issue and Feature template (espressif#5999)

Summary

This PR contains adding:

Issue template using forms
Feature Template using forms
Update of Pull Request template
All yaml files have been checked by online validator.

Pages are rendered here (for easier review):
Feature Request template
Issue Template

Impact

These templates can help with more accurate issue/PR explanations which can improve handling these contribution and in overall have a positive influence on User experience.

Related links

This PR closed issue espressif#5956

Author: VojtechBartoska

Diff for: README.md

@@ -38,7 +38,7 @@ You can use [EspExceptionDecoder](https://github.com/me-no-dev/EspExceptionDecod
 ### Issue/Bug report template
 Before reporting an issue, make sure you've searched for similar one that was already created. Also make sure to go through all the issues labelled as [Type: For reference](https://github.com/espressif/arduino-esp32/issues?q=is%3Aissue+label%3A%22Type%3A+For+reference%22+).
 
-Finally, if you are sure no one else had the issue, follow the [issue template](docs/ISSUE_TEMPLATE.md) while reporting any issue.
+Finally, if you are sure no one else had the issue, follow the **Issue template** or **Feature request template** while reporting any [new Issue](https://github.com/espressif/arduino-esp32/issues/new/choose).
 
 ### Contributing