Create CONTRIBUTING.md

CONTRIBUTING.md

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+# How to contribute
+
+Hi, and welcome! I'm new to this world and I'm looking for improvements in my code. If you have a suggestion, or find a bug, or want to tinker with the script, 
+I'd love to hear it!
+
+## Testing
+
+Testing is always welcome, although this project is not big, I'm not perfect. I build this project, at first, for my personal needs and that implies certain SO,
+hardware and expectations.
+
+## Submitting changes
+
+Fork this repository [web check](https://github.com/Jaime-alv/web_check.git) first, tinker yourself, do whatever you want with it, and finally make a pull request.
+Be sure to include every change you've done.
+
+## Submitting enhacement
+
+You can submit your ideas through Issues/Feature request. I'd love to hear your ideas!
+
+## Submitting bugs
+
+As with new features, this is done in Issues.
+
+## Coding conventions
+
+I'm following some general conventions.
+- Functions are lower_snake_case
+- Class are PascalCase
+- Consider the people who will read your code, and make it look nice for them.
+- If you can, avoid using single term variables.
+- Use relative paths when possible.