Babel 7 example readme with warning

.gitignore

@@ -1,3 +1,4 @@
+.idea
 .DS_STORE
 .eslintcache
 *.swp

CHANGELOG.md

@@ -78,6 +78,7 @@
 
 ### Chore & Maintenance
 
+- `[examples]` added README with warning incompatibility between jest, node 10 and npm to example using Babel 7 ([#7395](https://github.com/facebook/jest/issues/7395))
 - `[jest-watcher]` Standardize filenames ([#7314](https://github.com/facebook/jest/pull/7314))
 - `[jest-circus]` Standardize file naming in `jest-circus` ([#7301](https://github.com/facebook/jest/pull/7301))
 - `[docs]` Add synchronous test.each setup ([#7150](https://github.com/facebook/jest/pull/7150))

examples/babel-7/README.md

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+# babel-7
+> This example shows how to setup jest with babel.
+
+This is a barebones example that demonstrates jest and babel integration.
+
+ **WARNING**
+
+ If you are using jest version 23 with node version 10 and npm then this repository probably will not work for you. For more information please refer to this [jest issue](https://github.com/facebook/jest/issues/7395) on GitHub. This issue should be fixed in the next major release of jest (v24) when the dependency on babel 6 is dropped.
+
+ You have two options solving this:
+ 1) Either switch to yarn; or
+ 2) Downgrade node to version 8. Consider using [nvm](https://github.com/creationix/nvm) which simplifies managing multiple versions of node.
+