Add new article "How to add a new language to the ABP project"

docs/en/Community-Articles/2020-11-02-How-To-Add-New-Language/POST.md

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+# How to add a new language to your ABP project?
+
+Adding a new language to your ABP project is pretty simple.  Let's add the German language to our ABP project:
+
+
+
+1. Go to your solution's root folder and write the following CLI command. This command will generate an empty translation file from English.
+    ```bash
+    abp translate -c de-DE
+    ```
+    
+    Check out for [the complete supported culture codes](https://docs.microsoft.com/en-us/bingmaps/rest-services/common-parameters-and-types/supported-culture-codes).
+    
+2. Fill the `target` fields in your target language.
+
+    ![Fill target fields](language-target.png)
+
+3. Copy `abp-translation.json` your solution's root folder (Do not change the filename!)
+
+4. Run the following command. This command will create the necessary `json` files.
+     ```bash
+     abp translate --apply
+     ```
+
+5. Open your solution and add the new language to the language list. To do this;
+
+    * open `MyProjectNameDomainModule.cs` and in `ConfigureServices` you'll find `Configure<AbpLocalizationOptions>`. If you have `HttpApi.Host` project then you need to add this in `MyProjectNameHttpApiHostModule.cs`
+
+    ```
+    options.Languages.Add(new LanguageInfo("de-DE", "de-DE", "Deutsche", "de"));
+    ```
+
+    ![Add to languages](add-to-languages.png)
+
+    The last parameter is the flag icon. You can find the list of flag icons on https://flagicons.lipis.dev/
+
+  6. The last step is running the DbMigrator project. It will seed the database for the new language. 
+        ![The database table](database-table.png)
+
+
+
+Close the IIS Express / Kestrel to invalidate the language cache and run the project. You will see the new language on your website.
+
+![See the final result](website-new-language.png)
+