contribution guide

CONTRIBUTING.md

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+
+# How to contribute to Codecrypt?
+
+1. Fork and add a feature or a correction
+2. Check that the feature/correction is applicable (see below)
+3. Check that the code is in a good shape (also below)
+4. Send pull request
+5. Profit
+
+### Applicable features
+
+- All cryptography should be post-quantum (this mainly removes group-based
+  asymmetric primitives)
+- The program is strictly off-line, almost-non-interactive, commandline only
+- Algorithms that are not mainstream are better
+- Less code is always better
+- Less magic is always better
+
+### Good shape of the code
+
+- Compile with `-Wall`
+- Format the code using `astyle --style=linux -xl -xk -pdtLnU -M80`
+- Try to follow similar naming conventions as the rest of the project
+- Automated memory management is always better
+- Use a modern C++ (unlike what codecrypt started with)