Feature #4841: Added flatpak manifest.

Imported shared-modules for flatpak from https://github.com/flathub/shared-modules

packaging/flatpak/com.freerdp.FreeRDP.json

@@ -0,0 +1,103 @@
+{
+    "app-id": "com.freerdp.FreeRDP",
+    "runtime": "org.freedesktop.Platform",
+    "runtime-version": "18.08",
+    "sdk": "org.freedesktop.Sdk",
+    "build-options" : {
+        "cflags": "-O2 -g",
+        "cxxflags": "-O2 -g"
+    },
+    "command": "xfreerdp",
+    "cleanup": [
+    ],
+    "finish-args": [
+        /* X11 + XShm access */
+        "--share=ipc",
+				"--socket=x11",
+				"--socket=fallback-x11",
+        /* Needs to talk to the network */
+        "--share=network",
+        /* Play sounds redirected from guests */
+        "--socket=pulseaudio",
+        /* Wayland access */
+        "--socket=wayland",
+				/* Allow rw access to download folder */
+				"--filesystem=xdg-download"
+    ],
+    "modules": [
+    {
+        /**
+         * libfreerdp use xprop to try to detect keyboard layout
+         */
+        "name": "xprop",
+        "sources": [
+        {
+            "type": "archive",
+            "url": "https://xorg.freedesktop.org/releases/individual/app/xprop-1.2.3.tar.bz2",
+            "sha256": "d22afb28c86d85fff10a50156a7d0fa930c80ae865d70b26d805fd28a17a521b"
+        }
+        ]
+    },
+    "shared-modules/udev/udev-175.json",
+    "shared-modules/dbus-glib/dbus-glib-0.110.json",
+    {
+        "name": "libusb",
+        "config-opts": ["--disable-static"],
+        "sources": [
+            {
+                "type": "git",
+                "url": "https://github.com/libusb/libusb.git",
+                "tag": "v1.0.22",
+                "commit": "0034b2afdcdb1614e78edaa2a9e22d5936aeae5d"
+            }
+        ]
+    },
+    {
+        "name": "pcsc",
+        "config-opts": [
+            "--disable-libsystemd",
+            "--enable-pic",
+            "--disable-libusb",
+            "--enable-shared"
+        ],
+        "sources": [
+            {
+                "type": "git",
+                "url": "https://salsa.debian.org/rousseau/PCSC.git",
+                "tag": "pcsc-1.8.24",
+                "commit": "73d95ada3221c060cbd7b6aa2375453f9d0e359b"
+            }
+        ]
+    },
+    {
+        "name": "freerdp",
+        "buildsystem": "cmake-ninja",
+        "cleanup": [
+        ],
+        "config-opts": [
+        "-DCMAKE_BUILD_TYPE:STRING=Release",
+        "-DCMAKE_INSTALL_LIBDIR:PATH=lib",
+        "-DCHANNEL_TSMF:BOOL=ON",
+        "-DCHANNEL_URBDRC:BOOL=ON",
+        "-DBUILD_TESTING:BOOL=OFF",
+        "-DWITH_MANPAGES:BOOL=OFF",
+        "-DWITH_GSSAPI:BOOL=OFF",
+        "-DWITH_PCSC:BOOL=ON",
+        "-DWITH_SERVER:BOOL=ON",
+        "-DWITH_SAMPLE:BOOL=ON",
+        "-DWITH_CUPS:BOOL=ON",
+        "-DWITH_FFMPEG:BOOL=ON",
+        "-DWITH_DSP_FFMPEG:BOOL=ON",
+        "-DWITH_OSS:BOOL=OFF",
+        "-DWITH_PULSE:BOOL=ON"
+        ],
+        "sources": [
+        {
+            "type": "git",
+            "url": "https://github.com/FreeRDP/FreeRDP.git",
+            "branch": "master"
+        }
+        ]
+    }
+    ]
+}