Add contribution templates

CONTRIBUTING.md

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+Thanks for helping out! 😇
+
+### Raising an issue
+
+* Make sure the issue hasn't been raised yet
+* Include **screenshots** and animated GIFs in your issue whenever possible
+* Tag your issue accordingly: bug, enhancement, or question
+
+### Submitting a Pull Request
+
+* Include **screenshots** and animated GIFs in your pull request whenever possible
+* Use the present tense ("Add feature" not "Added feature")
+* Use the imperative mood ("Move cursor to..." not "Moves cursor to...")
+* Limit the first line to 72 characters or less
+* Reference issues and pull requests liberally
+
+### Bulma Sass styleguide
+
+* **No semi-colons** `;` or **curly braces** `{` `}`
+* **No camelCase**
+* Use only **classes**
+* Order the CSS properties **alphabetically**
+* Order the CSS rule by
+  * direct styles
+  * nested tags
+  * pseudo-classes
+  * color modifiers
+  * size modifers
+  * modifiers
+  * responsive styles
+* Add appropriate one-line comments for each of these sections within a CSS rule
+* **No trailing space**
+* End files with a **newline**
+
+```sass
+.element
+  @extend .something
+  +mixin
+  property: value
+  span
+    // ...
+  div
+    // ...
+  .child
+    // ...
+  &:pseudo-class
+    // ...
+  // Colors
+  @each $name, $pair in $colors
+    // Loop
+  // Sizes
+  &.is-small
+    // ...
+  &.is-medium
+    // ...
+  &.is-large
+    // ...
+  // Modifiers (ordered alphabetically)
+  &.has-icons
+    // ...
+  &.is-active
+    // ...
+  &.is-fullwidth
+    // ...
+  // Responsiveness
+  +mobile
+    // ...
+  +tablet
+    // ...
+  +desktop
+    // ...
+```

ISSUE_TEMPLATE.md

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+Thanks for helping out! 😇
+
+### Prerequisites
+
+If it's a bug on the **website**, submit an issue on the appropriate repository: [https://github.com/jgthms/bulma-website](https://github.com/jgthms/bulma-website)
+
+* [ ] Is this about Bulma the **CSS framework** and **not** about the Bulma website?
+* [ ] Which **version** of Bulma are you using?
+* [ ] Which **browser** are you using?
+* [ ] If it's a **Sass** issue, which version of Sass are you using?
+* [ ] Are you sure this issue is not a **duplicate**?
+
+### Description
+
+[Description of the bug, enhancement, or question]
+[Please tag accordingly]
+
+### Steps to Reproduce
+
+1. [First Step]
+2. [Second Step]
+3. [and so on...]
+
+_Expected behavior:_ [What you expected to happen]
+
+_Actual behavior:_ [What actually happened]
+
+**Screenshots** are more than welcome!

PULL_REQUEST_TEMPLATE.md

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+Fixes #
+
+Changes proposed:
+
+* [ ] Add
+* [ ] Fix
+* [ ] Remove
+* [ ] Update
+
+### Requirements
+
+* [ ] Pull the latest master branch
+* [ ] Run `npm install` to install all Bulma dependencies
+* [ ] Make sure your Sass code is compliant with the [Bulma Sass styleguide](https://github.com/jgthms/bulma/blob/master/CONTRIBUTING.md#bulma-sass-styleguide)
+* [ ] If your PR fixes an issue, reference that issue
+* [ ] If your PR has lots of commits, **squash** your commits first
+* [ ] Run `npm run build` before submitting your PR
+
+Thanks for helping out! 😇

README.md

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 There is **no** JavaScript included. People generally want to use their own JS implementation (and usually already have one). Bulma can be considered "environment agnostic": it's just the style layer on top of the logic.
 
+## Roadmap
+
+Bulma keeps track of the upcoming fixes and features on Trello: [Bulma roadmap](https://trello.com/b/5Lzqejo3/bulma-roadmap)
+
+It's more a tasklist than a roadmap, but it will give you an overview of where things are going!
+
 ## Documentation website
 
 This repository is **only** for the Bulma source files.