Add flatpak resources

Author: uglide

src/resources/flatpak/dev.rdm.RDM.desktop

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+[Desktop Entry]
+Version=1.0
+Name=RDM
+Comment=Cross-platform open source database management tool for Redis ®
+Type=Application
+Categories=Development;
+Exec=rdm
+Terminal=false
+StartupNotify=true
+Icon=dev.rdm.RDM

src/resources/flatpak/dev.rdm.RDM.metainfo.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<component type="desktop-application">
+    <id>dev.rdm.RDM</id>
+    <metadata_license>CC0-1.0</metadata_license>
+    <project_license>GPL-3.0-only</project_license>
+    <name>Redis Desktop Manager</name>
+    <summary>Cross-platform open source database management tool for Redis ®</summary>
+    <description>
+        <p>RDM — is a fast open source Redis ® database management application for Windows, Linux and MacOS.
+            This tool offers you an easy-to-use GUI to access your Redis ® DB and perform some basic operations: view keys as a tree, CRUD keys, execute commands via shell.
+            RDM supports SSL/TLS encryption, SSH tunnels and cloud Redis instances, such as: Amazon ElastiCache, Microsoft Azure Redis Cache and other Redis ® clouds.</p>
+    </description>
+    <url type="homepage">https://rdm.dev/</url>
+    <launchable type="desktop-id">dev.rdm.RDM.desktop</launchable>
+    <screenshots>
+        <screenshot type="default">
+            <image type="source">https://rdm.dev/static/img/features/all.png?v=20202</image>
+        </screenshot>
+    </screenshots>
+    <content_rating type="oars-1.0"/>
+    <releases>
+        <release version="2021.7" date="2021-07-16"/>
+    </releases>
+</component>