docs: add CONTRIBUTING.md and CONTRIBUTORS.md

CONTRIBUTING.md

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+# How to Contribute
+
+Contributions are always welcome!
+Please use the following guidelines when contributing to `wolfram-alpha-rs`:
+
+1. Fork `wolfram-alpha-rs`
+2. Clone your fork (`git clone https://github.com/$YOUR_USERNAME/wolfram-alpha-rs && cd wolfram-alpha-rs`)
+3. Create a new branch (`git checkout -b new-branch`)
+4. Make your changes
+5. Commit your changes (`git commit -am "your message"`)
+ * This project uses the
+ [conventional changelog format][conventional-changelog-format], so that we can
+ easily update the `CHANGELOG.md` using [clog][clog-cli].
+ * In addition to the conventions defined above, we also use `imp`, `wip`,
+   and `examples`.
+ * Format your commit subject line using the following format:
+   `TYPE(COMPONENT): MESSAGE` where `TYPE` is one of the following:
+    - `feat` - A new feature
+    - `imp` - An improvement to an existing feature
+    - `perf` - A performance improvement
+    - `docs` - Changes to documentation only
+    - `tests` - Changes to the testing framework or tests only
+    - `fix` - A bug fix
+    - `refactor` - Code functionality doesn't change, but underlying structure
+      may
+    - `style` - Stylistic changes only, no functionality changes
+    - `wip` - A work in progress commit (Should typically be `git rebase`'ed
+      away)
+    - `chore` - Catch all or things that have to do with the build system, etc.
+    - `examples` - Changes to an existing example, or a new example
+ * The `COMPONENT` is optional, and may be a single file, directory, or logical
+   component.
+   Can be omitted if commit applies globally
+6. Run the tests (`cargo test`)
+7. `git rebase` into concise commits and remove `--fixup`s
+   (`git rebase -i HEAD~NUM` where `NUM` is number of commits back)
+8. Push your changes back to your fork (`git push origin $your-branch`)
+9. Create a pull request! (You can also create the pull request first, and
+   we'll merge when ready.
+   This a good way to discuss proposed changes.)
+
+[clog-cli]: https://github.com/clog-tool/clog-cli "clog-tool/clog-cli"
+[conventional-changelog-format]: https://github.com/angular/angular.js/blob/master/CONTRIBUTING.md#commit "Angular Git Commit Guidelines"

CONTRIBUTORS.md

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+The following is a list of contributors to the
+[wolfram-alpha-rs][wolfram-alpha-rs] project, in alphabetical order.
+
+* [Nikita Pekin](https://github.com/indiv0)
+
+[wolfram-alpha-rs]: https://github.com/indiv0/wolfram-alpha-rs