Add CONTRIBUTING.md

CONTRIBUTING.md

@@ -0,0 +1,24 @@
+# Contribution Guidelines
+
+- **To add to the list:** Submit a pull request
+- **To remove from the list:** Open an issue
+
+- List items should be sorted *alphabetically*.
+- Each item should be limited to one link
+- The link should be the name of the package or project
+- Direct installation commands should follow on the next line, indented by 2 spaces and enclosed in \`\`
+- Descriptions should be clear, concise, and non-promotional
+- Descriptions should follow the link, on the same line
+
+## Quality standard
+
+To stay on the list, package repositories should adhere to these quality standards:
+
+- Generally useful to the community
+- Functional
+- Stable
+
+
+## Reporting issues
+
+Please open an issue if you find anything that could be improved or have suggestions for making the list a more valuable resource. Thanks!

README.md

@@ -4,7 +4,7 @@ A curated list of CTF frameworks, libraries, resources and softwares.
 
 ### Contributing
 
-Please take a quick gander at the [contribution guidelines](https://github.com/apsdehal/ctf-tools/CONTRIBUTING.md) first.
+Please take a quick look at the [contribution guidelines](https://github.com/apsdehal/ctf-tools/CONTRIBUTING.md) first.
 
 #### _If you know a tool that isn't present here, feel free to open a pull request._