Create CONTRIBUTING.md

CONTRIBUTING.md

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+# How to contribute to Typo
+
+The goal of this theme is to be as simple as possible, hence adding or changing existing 
+features need some thought. 
+
+Any change that is too niche or heavily tailored to a specific developer's need will be rejected, as 
+that would make some features cumbersome to set up.
+To avoid unnecessary work, please start a discussion or open an issue with a proposal.
+
+Any other reasonable changes are more than welcome, keep in mind the guidelines: 
+- keep the code as minimal as possible, and avoid comments in the code unless needed;
+- keep the parameters (e.g. in hugo.toml) as concise and clear as possible;
+- update the wiki if needed, trying to maintain the current style of writing;
+- refrain from breaking existing behavior, for example, make a new feature disabled by default.
+
+<br>
+Thank you, <br>
+Francesco