docs(windows): Add Discord Voicemeeter Guide (#2555)

Co-authored-by: oopsuwu <60373320+oopsuwu@users.noreply.github.com>
Co-authored-by: ReenigneArcher <42013603+ReenigneArcher@users.noreply.github.com>

Author: BeeLeDev

docs/source/about/guides/guides.rst

@@ -8,3 +8,4 @@ Collection of guides written by the community!
 
    app_examples
    linux
+   windows

docs/source/about/guides/windows.rst

@@ -0,0 +1,10 @@
+Windows
+=======
+
+Collection of Sunshine Windows host guides.
+
+.. toctree::
+   :maxdepth: 1
+   :glob:
+
+   windows/*

docs/source/about/guides/windows/discord_voicemeeter.rst

@@ -0,0 +1,37 @@
+Discord call audio cancellation with Voicemeeter (Standard)
+===========================================================
+
+Voicemeeter
+^^^^^^^^^^^
+
+#. Click Hardware Out
+#. Set the physical device you recieve audio to as your Hardware Out with MME
+#. Turn on BUS A for the Virtual Input
+
+Windows
+^^^^^^^
+
+#. Open the sound settings
+#. Set your default Playback as Voicemeeter Input
+
+.. note:: Run audio in the background to find the device that your Virtual Input is using
+   (Voicemeeter In #), you will see the bar to the right of the device have green bars
+   going up and down. This device will be referred to as Voicemeeter Input.
+
+Discord
+^^^^^^^
+
+#. Open the settings
+#. Go to Voice & Video
+#. Set your Output Device as the physical you receive audio to
+
+.. note:: It is usually the same device you set for Hardware Out in Voicemeeter.
+
+Sunshine
+^^^^^^^^
+
+#. Go to Configuration 
+#. Go to the Audio/Video tab
+#. Set Virtual Sink as Voicemeeter Input
+
+.. note:: This should be the device you set as default previously in Playback.