feat: add contributing guidelines and license file

- Introduced a new CONTRIBUTING.md file to outline contribution processes, including bug reporting, pull request procedures, and development setup.
- Added a LICENSE file to specify the MIT License for the project, clarifying the terms under which contributions are made.
- Enhanced the README.md to link to the new contributing guidelines and license, improving project documentation and accessibility for contributors.
- Created issue templates for bug reports and feature requests to streamline the contribution process and improve issue tracking.

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: '[BUG] '
+labels: bug
+assignees: ''
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: '[FEATURE] '
+labels: enhancement
+assignees: ''
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.

CONTRIBUTING.md

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+# Contributing to ngx-dev-toolbar
+
+We love your input! We want to make contributing to ngx-dev-toolbar as easy and transparent as possible, whether it's:
+
+- Reporting a bug
+- Discussing the current state of the code
+- Submitting a fix
+- Proposing new features
+- Becoming a maintainer
+
+## We Develop with Github
+
+We use GitHub to host code, to track issues and feature requests, as well as accept pull requests.
+
+## Pull Requests Process
+
+1. Fork the repo and create your branch from `main`
+2. If you've added code that should be tested, add tests
+3. Ensure the test suite passes
+4. Update the documentation
+5. Issue that pull request!
+
+## Any contributions you make will be under the MIT Software License
+
+When you submit code changes, your submissions are understood to be under the same [MIT License](LICENSE) that covers the project.
+
+## Report bugs using Github's [issue tracker](https://github.com/yourusername/ngx-dev-toolbar/issues)
+
+We use GitHub issues to track public bugs. Report a bug by [opening a new issue](https://github.com/yourusername/ngx-dev-toolbar/issues/new/choose).
+
+## Write bug reports with detail, background, and sample code
+
+**Great Bug Reports** tend to have:
+
+- A quick summary and/or background
+- Steps to reproduce
+  - Be specific!
+  - Give sample code if you can
+- What you expected would happen
+- What actually happens
+- Notes (possibly including why you think this might be happening, or stuff you tried that didn't work)
+
+## Development Process
+
+1. Clone the repository
+2. Install dependencies: `npm install`
+3. Run tests: `npm test`
+4. Start development server: `npm start`
+
+## License
+
+By contributing, you agree that your contributions will be licensed under its MIT License.

LICENSE

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+MIT License
+
+Copyright (c) 2024 ngx-dev-toolbar
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.