Add cosmic-player

Author: jackpot51

.gitmodules

@@ -94,3 +94,7 @@
 	path = cosmic-idle
 	url = https://github.com/pop-os/cosmic-idle.git
 	branch = master
+[submodule "cosmic-player"]
+	path = cosmic-player
+	url = https://github.com/pop-os/cosmic-player.git
+	branch = master

README.md

@@ -16,6 +16,7 @@ Currently an incomplete **alpha**. Testing instructions below for various distri
 * [cosmic-notifications](https://github.com/pop-os/cosmic-notifications)
 * [cosmic-osd](https://github.com/pop-os/cosmic-osd)
 * [cosmic-panel](https://github.com/pop-os/cosmic-panel)
+* [cosmic-player](https://github.com/pop-os/cosmic-player)
 * [cosmic-randr](https://github.com/pop-os/cosmic-randr)
 * [cosmic-screenshot](https://github.com/pop-os/cosmic-screenshot)
 * [cosmic-session](https://github.com/pop-os/cosmic-session)

cosmic-player

@@ -16,6 +16,7 @@ build:
     {{ just }} cosmic-notifications/build-release
     {{ make }} -C cosmic-osd all
     {{ just }} cosmic-panel/build-release
+    {{ just }} cosmic-player/build-release
     {{ just }} cosmic-randr/build-release
     {{ just }} cosmic-screenshot/build-release
     {{ just }} cosmic-settings/build-release
@@ -41,6 +42,7 @@ install rootdir="" prefix="/usr/local": build
     {{ just }} rootdir={{rootdir}} prefix={{prefix}} cosmic-notifications/install
     {{ make }} -C cosmic-osd install DESTDIR={{rootdir}} prefix={{prefix}}
     {{ just }} rootdir={{rootdir}} prefix={{prefix}} cosmic-panel/install
+    {{ just }} rootdir={{rootdir}} prefix={{prefix}} cosmic-player/install
     {{ just }} rootdir={{rootdir}} prefix={{prefix}} cosmic-randr/install
     {{ just }} rootdir={{rootdir}} prefix={{prefix}} cosmic-screenshot/install
     {{ just }} rootdir={{rootdir}} prefix={{prefix}} cosmic-settings/install
@@ -78,6 +80,7 @@ clean:
     {{ just }} cosmic-idle/clean
     rm -rf cosmic-launcher/target
     rm -rf cosmic-panel/target
+    rm -rf cosmic-player/target
     rm -rf cosmic-notifications/target
     rm -rf cosmic-osd/target
     rm -rf cosmic-randr/target