Added CONRTIBUTING.md

CONTRIBUTING.md

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+# Contributing
+
+Welcome! Thank you for your interest in contributing to Misconfiguration Manager!
+
+## Adding a new technique
+If creating a pull request for a new technique, please follow these steps:
+
+1. Review open pull requests for technique numbering conflicts
+2. Create a new directory under the relevant technique category (e.g., [CRED](./attack-techniques/CRED/)) in the format of `<CATEGORY>-n` where `n` is the highest number technique in the category +1
+3. Create the primary markdown file in the format of `<category-#_description.md>`
+4. Copy the relevant template ([attack](./attack-techniques/_attack-template.md) or [defense](./defense-techniques/_defense-techniques-list.md)) into the description markdown file
+5. Fill out all sections of the template to the best of your ability
+6. Include links to relevant offensive and defensive IDs
+7. Review other techniques in the category for examples
+8. Update other techniques if necessary using "Replace in Files" feature of VS Code
+9. The submission does not have to be complete or perfect but please note what needs additional work
+
+
+## Issues
+If you find any incorrect or incomplete information, please open an issue. We encourage you to submit a pull request with your recommended changes. Be the change you want to see!
+
+## Pull requests
+Before creating a pull request, create a fork of the `main` branch and push your work to your fork. From there, you can open a pull request to the Misconfiguration Repository.
+