Add contribution guideline (#28)

add a contribution guideline

CONTRIBUTING.md

@@ -0,0 +1,33 @@
+# How to contribute to EMUcan
+
+## **Did you find a bug?**
+
+- Open a New Issue and describe the Bug so that it can be reproduced.
+
+- The more information you put inside, the better!
+
+## **Did you write a patch that fixes a bug?**
+
+- Open a new GitHub pull request with the patch.
+
+- Ensure the PR description clearly describes the problem and solution. Include the relevant issue number if applicable.
+
+## **Do you intend to add a new feature or change an existing one?**
+
+- Open a New Issue and describe it.
+
+- If you have the code ready, open a new GitHub pull request. Include the relevant issue number in the description.
+
+## **Do you have questions about the source code?**
+
+- Open a New Issue with the question.
+
+## **Automated code checks**
+
+Any PR is checked with the help of GitHub Actions for:
+
+- Spelling and natural language.
+
+- Formatting against the build autoformat of the Arduino IDE, [STRG]+[T] / [CMD]+[T]
+
+Thanks! :heart: :heart: :heart:

README.md

@@ -6,7 +6,10 @@ It reads the EMU CAN Stream and decodes it into something useful.
 
 This works with any CAN enabled device, MCP2515, Teensy, ESP32, STM32, Arduino UNO R4 and more.
 
-[![License: GPL v3](https://img.shields.io/badge/License-GPLv3-blue.svg)](https://www.gnu.org/licenses/gpl-3.0) [![arduino-library-badge](https://www.ardu-badge.com/badge/EMUcan.svg?)](https://www.ardu-badge.com/EMUcan) [![CI badge](https://github.com/designer2k2/EMUcan/actions/workflows/compile-examples.yml/badge.svg)](https://github.com/designer2k2/EMUcan/actions) [![CI badge](https://github.com/designer2k2/EMUcan/actions/workflows/unit-test.yml/badge.svg)](https://github.com/designer2k2/EMUcan/actions)
+[![License: GPL v3](https://img.shields.io/badge/License-GPLv3-blue.svg)](https://www.gnu.org/licenses/gpl-3.0)
+[![arduino-library-badge](https://www.ardu-badge.com/badge/EMUcan.svg?)](https://www.ardu-badge.com/EMUcan)
+[![CI badge](https://github.com/designer2k2/EMUcan/actions/workflows/compile-examples.yml/badge.svg)](https://github.com/designer2k2/EMUcan/actions)
+[![CI badge](https://github.com/designer2k2/EMUcan/actions/workflows/unit-test.yml/badge.svg)](https://github.com/designer2k2/EMUcan/actions)
 [![Super-Linter](https://github.com/designer2k2/EMUcan/actions/workflows/super-linter.yml/badge.svg)](https://github.com/marketplace/actions/super-linter)
 
 **Content:**
@@ -258,3 +261,4 @@ Please see in the examples on how to make this happen on MCP2515, Teensy and ESP
 ### Support
 
 Please feel free to use/extend/report bugs/request features!
+Take a look at the [Contribution Documents](https://github.com/designer2k2/EMUcan/blob/main/CONTRIBUTING.md) to see how to it.