minor #336 Github templates (Zales0123)

This PR was merged into the 1.0 branch.

Discussion
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Based on [this PR](Sylius/PayPalPlugin#217) from PayPalPlugin 🚀 

Commits
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9d14f27 Issues templates
af74363 Pull Request template

.github/ISSUE_TEMPLATE/bug-report.md

@@ -0,0 +1,17 @@
+---
+name: "Bug Report \U0001F41B"
+about: Report a problem or error
+title: '[Bug] ...'
+labels: 'Bug'
+---
+
+**SyliusRefundPlugin 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 SyliusRefundPlugin, 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 🎉

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,6 @@
+| Q               | A
+| --------------- | -----
+| Branch?         | 1.0 (bug fixes, improvements), master (new features)
+| Bug fix?        | no/yes
+| New feature?    | no/yes
+| Related tickets | fixes #X, partially #Y, mentioned in #Z