Add contributing guide

CONTRIBUTING.md

@@ -1,3 +1,32 @@
-# WORK IN PROGRESS, NOT READY FOR USE
+# LibUDPard contribution guidelines
 
-While this is a work in progress, contribute via the forums at [https://forum.opencyphal.org/](https://forum.opencyphal.org/)
+## Standards
+
+The library shall be implemented in ISO C99/C11 following MISRA C:2012.
+The MISRA compliance is enforced by Clang-Tidy and SonarQube.
+Deviations are documented directly in the source code as follows:
+
+```c
+// Intentional violation of MISRA: <some valid reason>
+<... deviant construct ...>
+```
+
+The full list of deviations with the accompanying explanation can be found by grepping the sources.
+
+Do not suppress compliance warnings using the means provided by static analysis tools because such deviations
+are impossible to track at the source code level.
+An exception applies for the case of false-positive (invalid) warnings -- those should not be mentioned in the codebase.
+
+Unfortunately, some rules are hard or impractical to enforce automatically,
+so code reviewers shall be aware of MISRA and general high-reliability coding practices
+to prevent non-compliant code from being accepted into upstream.
+
+## Build & test
+
+Consult with the CI workflow files for the required tools and build & test instructions.
+You may want to use the [toolshed](https://github.com/OpenCyphal/docker_toolchains/pkgs/container/toolshed)
+container for this.
+
+## Releasing
+
+Simply create a new release & tag on GitHub.

README.md

@@ -1,11 +1,11 @@
-# Compact Cyphal/UDP v1 in C
+# Compact Cyphal/UDP in C
 
 [![Main Workflow](https://github.com/OpenCyphal-Garage/libudpard/actions/workflows/main.yml/badge.svg)](https://github.com/OpenCyphal-Garage/libudpard/actions/workflows/main.yml)
 [![Reliability Rating](https://sonarcloud.io/api/project_badges/measure?project=libudpard&metric=reliability_rating)](https://sonarcloud.io/summary?id=libudpard)
 [![Coverage](https://sonarcloud.io/api/project_badges/measure?project=libudpard&metric=coverage)](https://sonarcloud.io/summary?id=libudpard)
 [![Forum](https://img.shields.io/discourse/users.svg?server=https%3A%2F%2Fforum.opencyphal.org&color=1700b3)](https://forum.opencyphal.org)
 
-LibUDPard is a compact implementation of the Cyphal/UDP protocol stack in C99/C11 for high-integrity real-time
+LibUDPard is a compact implementation of the Cyphal/UDP protocol in C99/C11 for high-integrity real-time
 embedded systems.
 
 [Cyphal](https://opencyphal.org) is an open lightweight data bus standard designed for reliable intravehicular