Add Plexamp 3.4.0 (#5858)

* Add Plexamp 3.4.0

* Update 3.4.0.yaml

manifests/Plex/Plexamp/3.4.0.yaml

@@ -0,0 +1,34 @@
+# ================== General ==================
+Id: Plex.Plexamp
+Publisher: Plex
+Name: Plexamp
+Author: Plex
+Description: A beautiful Plex music player for audiophiles, curators, and hipsters.
+AppMoniker: plexamp
+Tags: multimedia, mp3, audio, player
+
+# ================== License ==================
+Homepage: https://plexamp.com/
+License: Copyright © 2021, Plex
+LicenseUrl: https://www.plex.tv/about/privacy-legal/plex-terms-of-service/
+
+# ================= Installer =================
+MinOSVersion: 10.0.0.0
+#Channel: stable                # Channel is not supported in this preview (5/24/2020)
+Version: 3.4.0
+
+Switches:
+      Custom: 
+      Silent: /S
+      SilentWithProgress: /S
+      #Interactive:             # Interactive is not supported in this preview (5/24/2020)
+      Language: en-US
+
+InstallerType: exe
+Installers:
+  - Arch: x64
+    Url: https://plexamp.plex.tv/plexamp.plex.tv/desktop/Plexamp%20Setup%203.4.0.exe
+    Sha256: 52D0C85C13E883E082C77E31528C55577CAB7DBDC07C2952C69E17639AE04C01
+    Scope: user
+    
+# ManifestVersion: 0.1.0