CONTRIBUTING.md in expectation of Hacktoberfest

CONTRIBUTING.md

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+# CONTRIBUTING
+
+PayloadAllTheThings's Teal :heart: pull requests :)
+Feel free to improve with your payloads and techniques !
+
+You can also contribute with a :beers: IRL, or using the sponsor button.
+
+## Techniques Folder
+
+Every section should contains the following files, you can use the `_template_vuln` folder to create a new technique folder:
+
+- README.md - vulnerability description and how to exploit it, including several payloads, more below
+- Intruder - a set of files to give to Burp Intruder
+- Images - pictures for the README.md
+- Files - some files referenced in the README.md
+
+## README.md format
+
+Use the following example to create a new technique `README.md` file.
+
+```markdown
+# Vulnerability Title
+
+> Vulnerability description
+
+## Summary
+
+* [Tools](#tools)
+* [Something](#something)
+  * [Subentry 1](#sub1)
+  * [Subentry 2](#sub2)
+* [References](#references)
+
+## Tools
+
+- [Tool 1](https://example.com)
+- [Tool 2](https://example.com)
+
+## Something
+
+Quick explanation
+
+## References
+
+- [Blog title - Author, Date](https://example.com)
+```