Update getting-started-csharp.md (neo-project#288)

Fixing grammar. Also added a tip regarding the missing dll when trying to use neon.

en-us/sc/getting-started-csharp.md

@@ -4,12 +4,12 @@ typora-root-url: ..\..
 
 ### How to use C# to write an NEO smart contract
 
-We currently recommend C# for developing smart contracts (though we support or plan to support Java, Kotlin, Go, C/C++, Python, JavaScript and other programming languages)
+We currently recommend C# for developing smart contracts (though we support or plan to support Java, Kotlin, Go, C/C++, Python, JavaScript and other programming languages).
 
-This section contains a short tutorial that guides you in configuring the C# development environment for NEO smart contracts and gives you an idea of ​​how to create a smart contract project and how to compile it.
+This section contains a short tutorial that guides you in configuring the C# development environment for NEO smart contracts. It also gives you an idea of ​​how to create a smart contract project and how to compile it.
 
    > [!Note]
-   > At present, all the projects have been upgraded to the Visual Studio 2017 version, if you want to use Visual Studio 2015 to create intelligent contracts can refer to [how to use C # to write NEOs intelligent contract for VS2015](getting-started-2015.md)
+   > At present, all the projects have been upgraded to the Visual Studio 2017 version. If you want to use Visual Studio 2015 to create intelligent contracts, refer to [how to use C # to write NEOs intelligent contract for VS2015](getting-started-2015.md).
 
 ## Development Tools
 
@@ -21,7 +21,7 @@ Download and install:
 
 [Visual Studio download address](https://www.visualstudio.com/products/visual-studio-community-vs)
 
-The installation process is very simple, follow the operation prompts step-by-step, it should be noted that you need to check the installation of `.NET Core cross-platform development`, otherwise you will not be able to open neo-vm project in step #3. The installation takes about ten minutes or up to an hour.
+The installation process is very simple, just follow the operation prompts step-by-step. It should be noted that you need to check the installation of `.NET Core cross-platform development`, otherwise you will not be able to open neo-vm project in step #3. The installation takes about ten minutes or up to an hour.
 
 ![install net core cross-platform development toolset](/assets/install_core_cross_platform_development_toolset.png)
 
@@ -37,7 +37,7 @@ Open Visual Studio 2017, open Tools, click on Extensions and Updates, click on t
 
 Installation and configuration steps:
 
-Download the [neo-compiler](https://github.com/neo-project/neo-compiler) project on Github, open the solution with Visual Studio 2017, publish the neon project,
+Download the [neo-compiler](https://github.com/neo-project/neo-compiler) project on Github, open the solution with Visual Studio 2017, and publish the neon project
 
 ![publish NEO compiler msil project](/assets/publish_neo_compiler_msil_project.png)
 
@@ -65,20 +65,20 @@ We now need to add this directory to our execution path. The PATH is the system
 
 ![edit environmental variables](/assets/edit_environmental_variables.png)
 
-Now run Command or PowerShell, and enter neon.exe. If there is no error and the output shows the version number (as shown) the environment variable configuration is successful
+Now run Command or PowerShell, and enter neon.exe. If there is no error and the output shows the version number (as shown), then the environment variable configuration is successful.
 
 ![powershell enviornment variabled updated correctly](/assets/powershell_enviornment_variabled_updated_correctly.png)
 
 
-NOTE. Windows 7 SP1 users might encounter an error "Unhandled Exception: System.DllNotFoundException: Unable to load DLL 'api-ms-win-core-console-l2-1-0.dll': The specified module could not be found". The required 'api-ms-win-core-console-l2-1-0.dll' file is only found in Windows 8 or later versions. This error can be resolved by obtaining a copy of 'api-ms-win-core-console-l2-1-0.dll' and putting it in the directory C:\Windows\System32.
+NOTE. Windows 7 SP1 users might encounter an error "Unhandled Exception: System.DllNotFoundException: Unable to load DLL 'api-ms-win-core-console-l2-1-0.dll': The specified module could not be found". The required 'api-ms-win-core-console-l2-1-0.dll' file is only found in Windows 8 or later versions. This error can be resolved by obtaining a copy of 'api-ms-win-core-console-l2-1-0.dll' and putting it in the directory C:\Windows\System32. This dll can be found in other folders on your computer(search it, then copy it to \System32), or alternatively found online.
 
 ## Create project
 
-After the above installation configuration is successful, you can create an NeoContract project in Visual Studio 2017.
+After the above installation configuration is successful, you can create a NeoContract project in Visual Studio 2017.
 
 ![new smart contract project](/assets/new_smart_contract_project.png)
 
-Once you create a project, it will automatically generate a C# file, the default class inherited from the SmartContract, as shown in the following:
+Once you create a project, it will automatically generate a C# file. The default class which inherits the SmartContract is shown in the following:
 
 ![smart contract function code](/assets/smart_contract_function_code.png)
 
@@ -97,7 +97,7 @@ public class Contract1: SmartContract
 }
 ```
 
-After you compiled it successfully, you will see` SmartContract1.avm` in the `bin/Debug` directory, which is the file that is generated as the NEO smart contract.
+After you compiled it successfully you will see` SmartContract1.avm` in the `bin/Debug` directory, which is the file that is generated as the NEO smart contract.
 
 ![compile smart contract](assets/compile_smart_contract.png)