Add readme, changelog and contributing docs

Author: vctr-dev

Changelog.md

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+# Change Log
+
+All notable changes to this project will be documented in this file. See [Conventional Commits](https://conventionalcommits.org) for commit guidelines.
+
+## 1.0.0 (2020-04-19)
+
+- Made task create webpack.config.js, index.html and src/index.html
+- Made task install required dependencies
+- Made task add scripts to `package.json`

Contributing.md

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+# How to contribute
+
+I love pull requests. And following this guidelines will make your pull request easier to merge.
+
+## Prerequisites
+
+- Install dependencies: `yarn`.
+
+## Development workflow
+
+1. Clone this repository into ~/dotfiles/mrm/webpack/
+2. Create a new branch
+3. Create a sandbox directory to test
+4. `cd` into the sandbox directory and run `mrm webpack`
+5. Make changes to the mrm task
+6. Wipe the sandbox directory and run `mrm webpack`
+7. See your changes
+
+## Other notes
+
+- I'm using [Prettier](https://github.com/prettier/prettier) to format code, so don’t worry much about code formatting.
+- Don’t commit generated files, like minified JavaScript.
+- Don’t change version number and changelog.
+
+## Need help?
+
+If you want to contribute but have any questions, concerns or doubts, feel free to ping maintainers. Ideally create a pull request with `WIP` (Work in progress) in its title and ask questions in the pull request description.

Readme.md

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+# mrm-task-webpack
+
+[mrm](https://github.com/sapegin/mrm) task that adds basic [webpack](https://webpack.js.org/) configuration and yarn scripts.
+
+This should allow you to do `yarn start:dev` immediately after running `mrm webpack`.
+
+## What it does
+
+- Installs dependencies
+- Adds yarn scripts to run Webpack and DevServer
+- Creates webpack.config.js, index.html, and src/index.js if they don't exist
+
+## Usage
+
+```bash
+yarn global add mrm mrm-task-webpack
+mrm webpack
+```
+
+### Scripts
+
+```bash
+yarn start:dev # starts webpack dev server
+yarn build:dev # builds webpack in development mode
+yarn build     # builds webpack in production mode
+```
+
+## Changelog
+
+The changelog can be found in [changelog](Changelog.md).
+
+## Contributing
+
+Everyone is welcome to contribute. Please take a moment to review the [contributing guidelines](Contributing.md).
+
+## Authors and license
+
+[Victor Chan](https://vctr.dev) and [contributors](https://github.com/victorzchan/mrm-task-webpack/graphs/contributors).
+
+MIT License, see the included [License.md](License.md) file.