Add README, issues and PRs templates

Author: silvanocerza

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: 🐛 Bug Report
+about: If something isn't working as expected 🤔.
+---
+
+## Bug Report
+
+### Current behavior
+
+<!-- Paste the full command you run -->
+
+<!-- Add a clear and concise description of the behavior. -->
+
+### Expected behavior
+
+<!-- Add a clear and concise description of what you expected to happen. -->
+
+### Environment
+
+- Language Server version (commit hash):
+- CLI version used (output of `arduino-cli version`):
+- OS and platform:
+
+### Additional context
+
+<!-- (Optional) Add any other context about the problem here. -->

.github/PULL_REQUEST_TEMPLATE.md

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+**Please check if the PR fulfills these requirements**
+
+- [ ] The PR has no duplicates (please search among the [Pull Requests](https://github.com/bcmi-labs/arduino-language-server/pulls)
+      before creating one)
+- [ ] The PR follows [our contributing guidelines](https://github.com/bcmi-labs/arduino-language-server#pull-requests)
+- [ ] Tests for the changes have been added (for bug fixes / features)
+
+* **What kind of change does this PR introduce?**
+<!-- Bug fix, feature, docs update, ... -->
+
+- **What is the current behavior?**
+<!-- You can also link to an open issue here -->
+
+* **What is the new behavior?**
+<!-- if this is a feature change -->
+
+* **Other information**:
+<!-- Any additional information that could help the review process -->
+
+---

README.md

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+# Arduino Language Server
+
+**Arduino Language Server** is the the tool that powers the autocompletion of the new [Arduino IDE 2][arduino-ide-repo].
+
+## Build
+
+To build the Arduino Language Server you need:
+
+- [Go][go-install] version 1.12 or later
+
+The project doesn't require `CGO` so it can be easily crosscompiled if necessary. To build for you machine just run:
+
+```
+go build
+```
+
+To run tests:
+
+```
+go test -v ./...
+```
+
+## How to contribute
+
+Contributions are welcome! Here are all the way you can contribute to the project.
+
+### Issue Reports
+
+High quality bug reports and feature requests are valuable contributions to the project.
+
+Before reporting an issue search existing pull requests and issues to see if it was already reported. If you have additional information to provide about an existing issue, please comment there. You can use the Reactions feature if you only want to express support.
+
+Qualities of an excellent report
+
+- The issue title should be descriptive. Vague titles make it difficult to understand the purpose of the issue, which might cause your issue to be overlooked.
+- Provide a full set of steps necessary to reproduce the issue. Demonstration code or commands should be complete and simplified to the minimum necessary to reproduce the issue.
+- Be responsive. We may need you to provide additional information in order to investigate and resolve the issue.
+- If you find a solution to your problem, please comment on your issue report with an explanation of how you were able to fix it and close the issue.
+
+### Pull Requests
+
+To propose improvements or fix a bug, feel free to submit a PR.
+
+### Legal requirements
+
+Before we can accept your contributions you have to sign the Contributor License Agreement
+Pull request checklist
+
+### Pull request checklist
+
+In order to ease code reviews and have your contributions merged faster, here is a list of items you can check before submitting a PR:
+
+- Create small PRs that are narrowly focused on addressing a single concern.
+- Write tests for the code you wrote.
+- Open your PR against the master branch.
+- Maintain clean commit history and use meaningful commit messages. PRs with messy commit history are difficult to review and require a lot of work to be merged.
+- Your PR must pass all CI tests before we will merge it. If you're seeing an error and don't think it's your fault, it may not be! The reviewer will help you if there are test failures that seem not related to the change you are making.
+
+[arduino-ide-repo]: https://github.com/arduino/arduino-ide
+[go-install]: https://golang.org/doc/install