Add jest-circus README (#7198)

* Add jest-circus README

* Fix lint, add changelog, and update jest-circus mentions

* Grammar is my jam

* Add this back

CHANGELOG.md

@@ -67,6 +67,7 @@
 - `[docs]` Removed useless expect.assertions in `TestingAsyncCode.md` ([#7131](https://github.com/facebook/jest/pull/7131))
 - `[docs]` Remove references to `@providesModule` which isn't supported anymore ([#7147](https://github.com/facebook/jest/pull/7147))
 - `[docs]` Update `setupFiles` documentation for clarity ([#7187](https://github.com/facebook/jest/pull/7187))
+- `[jest-circus]` Add readme.md ([#7198](https://github.com/facebook/jest/pull/7198))
 
 ### Performance
 

README.md

@@ -1,5 +1,5 @@
 <h1 align="center">
-  <img src="http://dp.hanlon.io/313y3u2D0p38/jest.png" height="150" width="150"/>
+  <img src="https://jestjs.io/img/jest.png" height="150" width="150"/>
   <p align="center">Jest</p>
   <p align="center" style="font-size: 0.5em">🃏 Delightful JavaScript Testing</p>
 </h1>

docs/JestObjectAPI.md

@@ -315,7 +315,7 @@ Returns the `jest` object for chaining.
 
 ### `jest.retryTimes()`
 
-Runs failed tests n-times until they pass or until the max number of retries are exhausted. This only works with jest-circus!
+Runs failed tests n-times until they pass or until the max number of retries are exhausted. This only works with [jest-circus](https://github.com/facebook/jest/tree/master/packages/jest-circus)!
 
 Example in a test:
 
@@ -326,22 +326,6 @@ test('will fail', () => {
 });
 ```
 
-To run with jest circus:
-
-Install jest-circus
-
-```
-yarn add --dev jest-circus
-```
-
-Then set as the testRunner in your jest config:
-
-```js
-module.exports = {
-  testRunner: 'jest-circus/runner',
-};
-```
-
 Returns the `jest` object for chaining.
 
 ### `jest.runAllTicks()`

packages/jest-circus/README.md

@@ -0,0 +1,40 @@
+<h1 align="center">
+  <img src="https://jestjs.io/img/jest.png" height="150" width="150"/>
+  <img src="https://jestjs.io/img/circus.png" height="150" width="150"/>
+  <p align="center">jest-circus</p>
+  <p align="center">The next-gen test runner for Jest</p>
+</h1>
+
+## Overview
+
+Circus is a flux-based test runner for Jest that is fast, easy to maintain, and simple to extend.
+
+## Installation
+
+Install `jest-circus` using yarn:
+
+```bash
+yarn add --dev jest-cicus
+```
+
+Or via npm:
+
+```bash
+npm install --save-dev jest-circus
+```
+
+## Configure
+
+Configure Jest to use `jest-circus` via the [`testRunner`](https://jestjs.io/docs/en/configuration#testrunner-string) option:
+
+```json
+{
+  "testRunner": "jest-circus/runner"
+}
+```
+
+Or via CLI:
+
+```bash
+jest --testRunner='jest-circus/runner'
+```

website/versioned_docs/version-23.3/JestObjectAPI.md

@@ -316,7 +316,7 @@ Returns the `jest` object for chaining.
 
 ### `jest.retryTimes()`
 
-Runs failed tests n-times until they pass or until the max number of retries are exhausted. This only works with jest-circus!
+Runs failed tests n-times until they pass or until the max number of retries are exhausted. This only works with [jest-circus](https://github.com/facebook/jest/tree/master/packages/jest-circus)!
 
 Example in a test:
 
@@ -327,22 +327,6 @@ test('will fail', () => {
 });
 ```
 
-To run with jest circus:
-
-Install jest-circus
-
-```
-yarn add --dev jest-circus
-```
-
-Then set as the testRunner in your jest config:
-
-```js
-module.exports = {
-  testRunner: 'jest-circus/runner',
-};
-```
-
 Returns the `jest` object for chaining.
 
 ### `jest.runAllTicks()`