Adhere to GitHub Community Standards

Makes the project more friendly to GitHub users by providing
conventional files.

Those changes will improve our score under the GitHub
community tab:

https://github.com/Respect/Validation/community

 - The CHANGELOG.md file was removed. It was outdated and
   not being maintained.
 - Minimalistic .github/PULL_REQUEST_TEMPLATE.md
 - Minimalistic .github/SECURITY.md
 - Minimalistic .github/CODE_OF_CONDUCT.md
 - Minimalistic .github/ISSUE_TEMPLATE

Author: alganet

.github/CODE_OF_CONDUCT.md

@@ -0,0 +1,20 @@
+<!--
+SPDX-FileCopyrightText: (c) Respect Project Contributors
+SPDX-License-Identifier: MIT
+-->
+
+# Code of Conduct
+
+## Our Pledge
+
+We pledge to make participation in our project a harassment-free experience for everyone.
+
+## Our Standards
+
+- Be respectful
+- Be collaborative
+- Be inclusive
+
+## Enforcement
+
+Contact the maintainers if you experience or witness unacceptable behavior.

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,19 @@
+---
+name: Bug Report
+about: Report a bug
+labels: bug
+---
+
+**Describe the bug**
+A clear description of the bug.
+
+**To Reproduce**
+Steps to reproduce.
+
+**Expected behavior**
+What should happen.
+
+**Environment**
+- OS: 
+- PHP Version:
+- Respect\Validation version: 

.github/ISSUE_TEMPLATE/feature_request.md

@@ -0,0 +1,14 @@
+---
+name: Feature Request
+about: Suggest a new feature
+labels: enhancement
+---
+
+**Is your feature request related to a problem?**
+Describe the problem.
+
+**Describe the solution**
+What do you want to happen.
+
+**Alternatives**
+Any alternatives considered.

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,19 @@
+<!--
+SPDX-FileCopyrightText: (c) Respect Project Contributors
+SPDX-License-Identifier: MIT
+-->
+
+# Security Policy
+
+## Reporting Vulnerabilities
+
+Report security issues using:
+
+https://github.com/Respect/Validation/security/advisories/new
+
+We will work to make them public in a timely fashion and properly credit
+whoever discovered it.
+
+## Supported Versions
+
+Only the latest version receives security updates.

.github/SECURITY.md

@@ -1,6 +1,6 @@
 version = 1
 
 [[annotations]]
-path = [ "*.yml", "*.yaml", ".git*", "*.dist", "docs/.pages", "docs/validators/.pages", "composer.json", "tests/fixtures/*", ".github/*.yml", ".github/workflows/**.yml" ]
+path = [ "*.yml", "*.yaml", ".git*", "*.dist", "docs/.pages", "docs/validators/.pages", "composer.json", "tests/fixtures/*", ".github/*.yml", ".github/workflows/**.yml", ".github/PULL_REQUEST_TEMPLATE.md", ".github/ISSUE_TEMPLATE/**" ]
 SPDX-FileCopyrightText = "Respect Project Contributors"
 SPDX-License-Identifier = "MIT"