Added flatpak files

Signed-off-by: Blagovest Petrov <blagovest@petrovs.info>

org.petrovs_info.tangraplay.appdata.xml

@@ -0,0 +1,32 @@
+<?xml version="1.0" encoding="utf-8"?>
+<component type="desktop">
+  <id>org.petrovs_info.tangraplay</id>
+  <launchable type="desktop-id">org.petrovs_info.tangraplay.desktop</launchable>
+  <metadata_license>CC0-1.0</metadata_license>
+  <project_license>LGPL-2.0+</project_license>
+  <name>TangraPlay</name>
+  <summary>TangraPlay</summary>
+  <description>
+    <p>Application for Radio Tangra</p>
+    <p xml:lang="en-GB">Приложение за радио Тангра</p>
+  </description>
+  <releases>
+    <release version="0.0.1" date="2020-30-21"/>
+  </releases>
+  <screenshots>
+    <screenshot type="default">
+      <image type="source">https://tangraplay.petrovs.info/screenshot.png</image>
+    </screenshot>
+  </screenshots>
+  <categories>
+    <category>Multimedia</category>
+  </categories>
+  <url type="homepage">https://tangraplay.petrovs.info</url>
+  <url type="bugtracker">https://code.petrovs.info/blago/TangraPlay/issues</url>
+  <project_group>petrovs_info</project_group>
+  <update_contact>blagovest_AT_petrovs.info</update_contact>
+  <provides>
+    <binary>tangraplay</binary>
+  </provides>
+  <content_rating type="oars-1.1"/>
+</component>

org.petrovs_info.tangraplay.desktop

@@ -0,0 +1,10 @@
+[Desktop Entry]
+Name=TangraPlay
+GenericName=TangraPlay
+Comment=TangraPlay
+Exec=tangraplay
+Terminal=false
+Icon=org.petrovs_info.tangraplay
+Type=Application
+X-KDE-PluginInfo-Website=http://tangraplay.petrovs.info
+Categories=Multimedia

org.petrovs_info.tangraplay.json

@@ -0,0 +1,27 @@
+{
+    "app-id": "org.petrovs_info.tangraplay",
+    "runtime": "org.kde.Platform",
+    "runtime-version": "5.11",
+    "sdk": "org.kde.Sdk",
+    "command": "tangraplay",
+    "finish-args": [
+        "--share=ipc",
+        "--socket=x11",
+        "--socket=wayland",
+        "--filesystem=host",
+        "--device=dri"
+    ],
+    "modules": [
+        {
+            "name": "tangraplay",
+            "buildsystem": "cmake-ninja",
+            "config-opts": ["-DCMAKE_BUILD_TYPE=RelWithDebInfo"],
+            "sources": [
+                {
+                    "type": "git",
+                    "url": "http://code.petrovs.info/blago/TangraPlay.git"
+                }
+            ]
+        }
+    ]
+}