Add contributing information

Only the section with ways to get involved.

CONTRIBUTING.md

@@ -0,0 +1,21 @@
+# Contributing
+
+Tanya is a project in active development, therefore any help is appreciated. Thank you for considering contributing
+to it, feel welcome.
+These guidelines describe ways to get started.
+
+## Ways to get involved
+
+* **Reporting a problem**: [https://issues.caraus.io/projects/tanya/issues](Report) bugs and usage problems you
+encounter.
+* **Fixing issues**: [https://issues.caraus.io/projects/tanya/issues](The bug tracker) contains a list of issues you
+can work on.
+* **Documentation**: You can improve API documentation by correcting grammar errors, completing existing texts and
+writing new ones, or providing usage examples.
+* **Testing**: Test coverage is important for a library. Writing tests is not only helpful, but is also a great way
+to get a feel for how tanya works.
+
+## Questions and suggestions
+
+* [Open an issue](https://issues.caraus.io/projects/tanya/issues)
+* [Send an email](mailto:info@caraus.de)

README.md

@@ -25,6 +25,7 @@ Tanya consists of the following packages:
 * `async`: Event loop (epoll, kqueue and IOCP).
 * `container`: Queue, Array, Singly and doubly linked lists, Buffers, UTF-8
 string, Hash set.
+* `format`: Formatting and conversion functions.
 * `math`: Arbitrary precision integer and a set of functions.
 * `memory`: Tools for manual memory management (allocators, smart pointers).
 * `network`: URL-Parsing, sockets, utilities.
@@ -63,7 +64,3 @@ is being tested on Windows and FreeBSD as well.
 3-week release cycle.
 
 Deprecated features are removed after one release (in approximately 6 weeks after deprecating).
-
-## Contributing
-
-Feel free to contact me if you have any questions: info@caraus.de.