Add CONTRIBUTING.md

CONTRIBUTING.md

@@ -0,0 +1,34 @@
+# Contributing
+
+## General
+
+Mitra is developed according to these principles:
+
+- Resilience. The primary function of Mitra is delivery of messages from publisher to the audience. It should be able to perform this task even in adversarial conditions.
+- Self-hosting. If some feature depends on other service (such as blockchain node), that service must be free / open source software and it must be able to run on affordable hardware. No dependecies on proprietary services allowed.
+- Low system requirements. The default configuration should work smoothly on a low-end VPS.
+- Privacy. In its default configuration, Mitra shouldn't require any personal info (other than username / public key) or collect usage statistics. It also shouldn't reveal more information about the user then necessary.
+
+## Before you start
+
+If you want to propose a change, please create an [issue](https://codeberg.org/silverpill/mitra/issues) first and explain what you want to do (unless it's something trivial).
+
+## Code
+
+Simplicity is more important than minor performance improvements.
+
+Avoid advanced language features unless there's a good reason to use them. The code should be comprehensible even to a Rust beginner.
+
+### Dependencies
+
+Try to minimize the number of dependencies.
+
+Prefer libraries maintained by volunteers over those developed by for-profit companies.
+
+### Code style
+
+Run `cargo clippy` to check code automatically. Try to follow the existing style when adding new features.
+
+### Commits
+
+Commits should be atomic (the tests should pass) and not too big. Commit messages should be informative.

README.md

@@ -119,6 +119,8 @@ Add blockchain configuration to `blockchains` array in your configuration file.
 
 ## Development
 
+See [CONTRIBUTING.md](./CONTRIBUTING.md)
+
 ### Start database server
 
 ```