Add CONTRIBUTING.md with contributor guidelines

Author: m3y54m

CONTRIBUTING.md

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+# Contributing to Embedded Engineering Roadmap
+
+We welcome contributions from everyone! To ensure a smooth collaboration, please follow these guidelines:
+
+## Practical Advice
+- Focus on delivering actionable content that can help others in their embedded engineering journey.
+- Provide code snippets, examples, and hands-on projects when possible.
+
+## Clarity
+- Write in clear and concise language. Avoid jargon unless necessary; if you use technical terms, provide definitions.
+- Use headings, bullet points, and lists to organize content effectively.
+
+## Resource Quality
+- Ensure that all referenced resources are reputable and up-to-date.
+- Link to official documentation, tutorials, and articles that enhance the understanding of the topic.
+
+## Organization
+- Keep the structure of your contributions consistent with the existing files in the repository.
+- Follow the existing naming conventions and organization patterns.
+
+## Accuracy
+- Verify facts and ensure that the content is technically correct.
+- If you are unsure about something, seek clarification or additional resources.
+
+## Respectful Collaboration
+- Treat all contributors with respect. Constructive feedback is encouraged.
+- Be open to different perspectives and ideas.
+
+## Inclusivity
+- Encourage contributions from diverse backgrounds and perspectives.
+- Avoid language that may exclude or alienate others.
+
+## Prioritized Topics
+- Focus on the topics outlined in the Embedded Engineering Roadmap.
+- Contribute to areas that you are passionate about and have expertise in.
+
+Thank you for helping to improve the Embedded Engineering Roadmap! We appreciate your contributions.