init: add initial files for DevOps toolkit

.github/dependabot.yml

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+---
+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+  - package-ecosystem: "docker"
+    directory: "/"
+    schedule:
+      interval: "weekly"

.github/pull_request_template.md

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+Closes: #XXX
+
+## Changes
+
+- DescribeYourChangeHere

CODEOWNERS

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+* @tungbq

CONTRIBUTING.md

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+# Contributing
+
+The following information provides a set of guidelines for contributing to the tungbq/devops-toolkit chain main repo. Use your best judgment, and, if you see room for improvement, please propose changes to this document.
+
+## First steps
+
+The first step is to find an issue you want to fix. To identify issues we think are good for first-time contributors, we add the **good first issue** label.
+Once you find an existing issue that you want to work on or if you have a new issue to create, continue below.
+
+## Proposing changes
+
+To contribute a change proposal, use the following workflow:
+
+1. [Fork the repository](https://github.com/tungbq/devops-toolkit).
+2. If you find this repository helpful, kindly consider showing your appreciation by giving it a star ⭐ Thanks! 💖
+3. [Add an upstream](https://docs.github.com/en/github/collaborating-with-pull-requests/working-with-forks/syncing-a-fork) so that you can update your fork.
+4. Clone your fork to your computer.
+5. Create a branch and name it appropriately.
+6. Work on only one major change in one pull request.
+7. Make sure all tests are passing locally.
+8. Next, rinse and repeat the following:
+
+    1. Commit your changes. Write a simple, straightforward commit message. To learn more, see [How to Write a Git Commit Message](https://chris.beams.io/posts/git-commit/).
+    2. Push your changes to your remote fork. To add your remote, you can copy/paste the following:
+
+    ```sh
+
+    #Remove origin
+
+    git remote remove origin
+
+    #set a new remote
+
+    git remote add my_awesome_new_remote_repo [insert-link-found-in-source-subtab-of-your-repo]
+
+    #Verify new remote
+
+    git remote -v
+
+    > my_awesome_new_remote_repo  [link-found-in-source-subtab-of-your-repo] (fetch)
+    > my_awesome_new_remote_repo  [link-found-in-source-subtab-of-your-repo] (push)
+
+    #Push changes to your remote repo
+
+    git push <your_remote_name>
+
+    #e.g. git push my_awesome_new_remote_repo
+    ```
+
+    3. Create a PR on the devops-toolkit repository. There should be a PR template to help you do so.
+    4. Wait for your changes to be reviewed. If you are a maintainer, you can assign your PR to one or more reviewers. If you aren't a maintainer, one of the maintainers will assign a reviewer.
+    5. After you receive feedback from a reviewer, make the requested changes, commit them to your branch, and push them to your remote fork again.
+    6. Once approval is given, feel free to squash & merge!

README.md

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-# devops-toolkit
-DevOps Toolkit: Container image for an all-in-one DevOps environment with popular tools like Ansible, Terraform, kubectl, AWS CLI, Azure CLI, PostgreSQL client, MySQL client, Git, and more.
+<h1 align="center">DevOps Toolkit</h1>
+
+<p align="center">Container image for an all-in-one DevOps environment with popular tools like Ansible, Terraform, kubectl, AWS CLI, Azure CLI, PostgreSQL client, MySQL client, Git, and more...</p>
+
+<p align="center">
+  <a href="https://img.shields.io/github/last-commit/tungbq/devops-toolkit/main"><img alt="last commit" src="https://img.shields.io/github/last-commit/tungbq/devops-toolkit/main" /></a>
+  <a href="https://github.com/tungbq/devops-toolkit/stargazers"><img alt="GitHub Repo stars" src="https://img.shields.io/github/stars/tungbq/devops-toolkit"/></a>
+</p>
+
+## Hit the Star! ⭐
+
+- If you find this repository helpful, kindly consider showing your appreciation by giving it a star ⭐ Thanks! 💖
+
+## Prerequisites
+
+Before you begin, make sure you have [Docker](https://docs.docker.com/engine/install/) installed. It's also beneficial to have a basic understanding of Docker concepts.
+
+## Contributing
+
+- See: [CONTRIBUTING.md](./CONTRIBUTING.md)
+- Looking for the issue to work on? Check the list of our open issues [**good first issue**](https://github.com/tungbq/devops-toolkit/issues?q=is%3Aissue+is%3Aopen+label%3A%22good+first+issue%22)
+- Feel free to open a new issue if you want to request more content about DevOps Dockerfile