Leverage GitHub templates

.github/ISSUE_TEMPLATE/Bug.md

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+---
+name: 🐞 Bug Report
+about: Something is broken? 🔨
+labels: bug, unconfirmed
+---
+
+<!--
+    Before you open an issue, make sure this one does not already exist.
+    Please also read the "guidelines for contributing" link above before posting.
+-->
+
+<!--
+    If you are reporting a bug, please try to fill in the following.
+    Otherwise remove it.
+-->
+
+### Environment
+
+#### Zabbix version
+
+```
+$ curl -X POST <your-zabbix-api-endpoint> \
+    -H 'Content-Type: application/json-rpc' \
+    -d '{"jsonrpc":"2.0","method":"apiinfo.version","params":{},"id":1}'
+# Change <your-zabbix-api-endpoint> with your Zabbix API endpoint (for example, "https://your-zabbix-domain/api_jsonrpc.php") and put the result here.
+```
+
+#### PhpZabbixApi version
+
+```
+$ composer show --latest confirm-it-solutions/php-zabbix-api
+# Put the result here.
+```
+
+#### PHP version
+
+```
+$ php -v
+# Put the result here.
+```
+
+## Subject
+
+<!--
+    Give here as many details as possible.
+    Next sections are for ERRORS only.
+-->
+
+## Minimal repository with the bug
+
+## Steps to reproduce
+
+## Expected results
+
+## Actual results
+
+<!--
+    If it's an error message or piece of code, use code block tags,
+    and make sure you provide the whole stack trace(s),
+    not just the first error message you can see.
+    More details here: https://github.com/confirm-it-solutions/php-zabbix-api/blob/2.x/CONTRIBUTING.md#issues
+-->

.github/ISSUE_TEMPLATE/Feature.md

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+---
+name: 🚀 Feature Request
+about: I have a suggestion (and may want to implement it 🙂)!
+labels: feature
+---
+
+## Feature Request
+
+<!-- Provide a summary of the feature. -->

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+    - name: StackOverflow
+      url: https://stackoverflow.com/questions/tagged/phpzabbixapi
+      about: 'Questions tagged with "phpzabbixapi" on StackOverflow'

.github/PULL_REQUEST_TEMPLATE.md

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+<!-- THE PR TEMPLATE IS NOT AN OPTION. DO NOT DELETE IT, MAKE SURE YOU READ AND EDIT IT! -->
+## Subject
+
+<!-- Describe your Pull Request content here -->
+
+<!--
+    Show us you choose the right branch.
+    Different branches are used for different things:
+    - 2.x is for everything backwards compatible, like patches, features and deprecation notices
+    - master is for deprecation removals and other changes that cannot be done without a BC-break
+    More details here: https://github.com/confirm-it-solutions/php-zabbix-api/blob/2.x/CONTRIBUTING.md#base-branch
+-->
+I am targeting this branch, because {reason}.
+
+<!--
+    Specify which issues will be fixed/closed.
+    Remove it if this is not related.
+-->
+
+Closes #{put_issue_number_here}.
+
+## Changelog
+
+<!-- MANDATORY
+    Fill the changelog part inside the code block.
+    Follow this schema: http://keepachangelog.com/
+    This will end up on https://github.com/confirm-it-solutions/php-zabbix-api/releases,
+    please keep it short and clear and to the point
+-->
+
+<!--
+    If you are updating something that doesn't require
+    a release, you can delete the whole "Changelog" section.
+    (eg. update to docs, tests)
+-->
+
+<!-- REMOVE EMPTY SECTIONS -->
+```markdown
+### Added
+- Method `Class::newMethod()` to do great stuff.
+
+### Changed
+
+### Deprecated
+
+### Removed
+
+### Fixed
+
+### Security
+```
+
+<!--
+    If this is a work in progress, uncomment the "To do" section.
+    You can add as many tasks as you want.
+    If some are not relevant, just remove them.
+-->
+<!--
+## To do
+
+- [ ] Update the tests;
+- [ ] Update the documentation;
+- [ ] Add an upgrade note.
+-->