[NLP] Introduce nlp project (#366)

[NLP] Introduce nlp project (#366)

* add nlp project

* Fix naming rules as PascalCase and fix errors in .csproj file

* Modify Nlp project about the code and TizenFx rule

* Modify Nlp project for  ACR review suggestion

* Modify Nlp project about the code and TizenFx rule

* Modify Nlp project about the code and TizenFx rule

* Modify Nlp project as suggestion of 20180817AM

* Modify Nlp project as suggestion of 20180817PM14:49

* Modify Nlp project as suggestion of 20180817PM16:25

* Modify Nlp project about return value and typo issue

* Modify Nlp project about void return

* Modify Nlp project with new async solution

* Modify Nlp project as async suggestion

* Modify Nlp project with more support

* Modify Nlp project about common steps

* Modify Nlp project about dispose etc.

* Modify Nlp project about Close api

* Modify Nlp project about error.

* Modify Nlp project about logic error

* Modify Nlp project about misc issue

* Modify Nlp project about SA1201

* Modify Nlp project about else logic