docs: intial draft for frontend review doc

style_guides/frontend-review-checklist.md

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+# Frontend Review Checklist
+
+## High level checks
+
+- [ ] The pull request adds value and the impact of the change is in line with [Frontend Style Guide](https://github.com/grafana/grafana/blob/master/style_guides/frontend.md).
+- [ ] The pull request works the way it says it should do.
+- [ ] The pull request does not increase the Angular code base.
+  > We are in the process of migrating to React so any increment of Angular code is generally discouraged from. (there are a few exceptions)
+- [ ] The pull request closes one issue if possible and does not fix unrelated issues within the same pull request.
+- [ ] The pull request contains necessary tests.
+
+## Low level checks
+
+- [ ] The pull request contains a title that explains the PR.
+- [ ] The pull request contains necessary link(s) to issue(s).
+- [ ] The pull request contains commits with commit messages that are small and understandable.
+- [ ] The pull request does not contain magic strings or numbers that could be replaced with an `Enum` or `const` instead.
+- [ ] The pull request does not increase the number of `implicit any` errors.
+- [ ] The pull request does not contain uses of `any` or `{}` that are unexplainable.
+- [ ] The pull request does not contain large React component that could easily be split into several smaller components.
+- [ ] The pull request does not contain back end calls directly from components, use actions and Redux instead.
+
+### Bug specific checks
+
+- [ ] The pull request contains only one commit if possible.
+- [ ] The pull request contains `closes: #Issue` or `fixes: #Issue` in pull request description.
+
+### Redux specific checks (skip if pull request does not contain Redux changes)
+
+- [ ] The pull request does not contain code that mutate state in reducers or thunks.
+- [ ] The pull request uses helpers `actionCreatorFactory` and `reducerFactory` instead of traditional `switch statement` reducers in Redux.
+- [ ] The pull request uses `reducerTester` to test reducers.
+- [ ] The pull request does not contain code that access reducers state slice directly, instead the code uses state selectors to access state.
+
+## Common bad practices
+
+### 1. Missing Props/State type
+
+- React Component definitions
+
+  ```jsx
+  // good
+  export class YourClass extends PureComponent<{},{}> { ... }
+
+  // bad
+  export class YourClass extends PureComponent { ... }
+  ```
+
+- React Component constructor
+
+  ```typescript
+  // good
+  constructor(props:Props) {...}
+
+  // bad
+  constructor(props) {...}
+  ```
+
+- React Component defaultProps
+
+  ```typescript
+  // good
+  static defaultProps: Partial<Props> = { ... }
+
+  // bad
+  static defaultProps = { ... }
+  ```