docs: add CONTRIBUTING

Author: laysakura

CONTRIBUTING.md

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+# Contributing to SpringQL-client-c
+
+Welcome, and thank you for your interest in contributing to SpringQL-client-c!
+
+There are many ways in which you can contribute, beyond writing code. The goal of this document is to provide a high-level overview of how you can get involved.
+
+## Asking Questions
+
+Have a question? Rather than opening an issue, use [Discussions](https://github.com/SpringQL/SpringQL-client-c/discussions) and open a post.
+
+## Providing Feedback
+
+Use [Discussions](https://github.com/SpringQL/SpringQL-client-c/discussions) as well. Your comments and feedback are welcome.
+
+## Reporting Issues
+
+Have you identified a reproducible problem in SpringQL? Have a feature request? We want to hear about it! Here's how you can report your issue as effectively as possible.
+
+### Look For an Existing Issue
+
+Before you create a new issue, please do a search in [open issues](https://github.com/SpringQL/SpringQL-client-c/issues) to see if the issue or feature request has already been filed.
+
+### Writing Good Bug Reports and Feature Requests
+
+File a single issue per problem and feature request. Do not enumerate multiple bugs or feature requests in the same issue.
+
+Do not add your issue as a comment to an existing issue unless it's for the identical input. Many issues look similar but have different causes.
+
+The more information you can provide, the more likely someone will be successful at reproducing the issue and finding a fix.
+
+Please use the issue template from GitHub web.
+
+## Creating Pull Requests
+
+Any fixes or features' addition/removal should be submitted via pull-requests.
+
+Ideally, each pull-request is linked to a single issue.
+
+Before we can accept a pull request from you, you'll need to sign a Contributor License Agreement (CLA). It is an automated process and you only need to do it once.
+
+# Thank You!
+
+Your contributions to open source, large or small, make great projects like this possible. Thank you for taking the time to contribute.