feature #217 Configure Github issues templates (Zales0123)

This PR was merged into the 1.3 branch.

Discussion
----------

| Q               | A
| --------------- | -----
| Branch?         | 1.2
| Bug fix?        | no
| New feature?    | no
| Related tickets |

Based on such templates [from Sylius](https://github.com/Sylius/Sylius/tree/master/.github/ISSUE_TEMPLATE). **Bug** and **Security** for now, we will see what is needed more in the future 🖖 

Commits
-------

2a6f4cd Configure Github issues templates

.github/ISSUE_TEMPLATE/bug-report.md

@@ -0,0 +1,17 @@
+---
+name: "Bug Report \U0001F41B"
+about: Report a problem or error
+title: '[Bug] ...'
+labels: 'Bug'
+---
+
+**SyliusPayPalPlugin version affected**: 1.x.y
+
+**Description**  
+<!-- A clear and concise description of the bug you are experiencing. -->
+
+**Steps to reproduce**  
+<!-- Code and/or configuration required to reproduce the bug. -->
+
+**Possible Solution**  
+<!--- Optional: if you have any suggestions on a fix/reason for the bug -->

.github/ISSUE_TEMPLATE/security-issue.md

@@ -0,0 +1,11 @@
+---
+name: "Security Issue \U0001F510"
+about: Please contact us at [email protected]
+title: ''
+labels: ''
+---
+
+If you think that you have found a security issue in SyliusPayPalPlugin, please do not use the issue tracker
+and do not post it publicly. Instead, all security issues should be sent to `[email protected]`.
+
+Thank you 🎉