Update README.md

README.md

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 - .NET Core 3 Runtime (Windows 10 will automatically prompt you to download it when you try to run SyncthingStatus).
 - An already set up and running Syncthing instance. Refer to [SETUP](https://github.com/mc0239/SyncthingStatus/blob/master/SETUP.md) for an example of how to set it up.
+
+## Building
+
+### Release build
+
+To create a release executable (*win-x64* target example):
+
+1. In Visual Studio 2019, go to _Build_ -> _Publish SyncthingStatus_.
+2. Create a new Publish Profile and set up the following:
+    - Deployment mode: *Framework-dependant*
+    - Target runtime: *win-x64*
+    - Open *File publish options* and check *Produce single file*.
+3. This build will generate a single executable file in *publish* folder (not *win-x64*).