Along with global launch of Windows 10 build 10240 (RTM), Microsoft opened the path for the developers to build and publish apps for Windows 10. The Software Development Kit (SDK) is available for download. This SDK for Windows 10 contains headers, libraries and tools you can use to build apps.
In this post, sharing/bookmarking the link to download the SDK Tools for Windows 10 along with the known issues currently there in this build.