Add enas nni version from contributor (#557)

* update readme in ga_squad

* update readme

* fix typo

* Update README.md

* Update README.md

* Update README.md

* update readme

* update

* fix path

* update reference

* fix bug in config file

* update nni_arch_overview.png

* update

* update

* update

* add enas_nni

examples/tuners/enas_nni/README.md

+ **Run ENAS in NNI**	
+ ===	
+ 
+  Now we have an enas example [enas-nni](https://github.com/countif/enas_nni) run in nni from our contributors.	
+ Thanks our lovely contributors. 	
+ And welcome more and more people to join us!
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