Adding metadata for F-Droid

metadata/en-US/full_description.txt

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+Sideband allows you to communicate with other people or LXMF-compatible systems over Reticulum networks using LoRa, Packet Radio, WiFi, I2P, or anything else Reticulum supports.
+
+It is completely free, end-to-end encrypted, permission-less, anonymous and infrastructure-less. Sideband uses the peer-to-peer and distributed messaging system LXMF. There is no sign-up, no service providers, no "end-user license agreements", no data theft and no surveillance. You own the system.
+
+Sideband also supports many useful and interesting functions, such as:
+
+<ul>
+<li>Secure and direct P2P telemetry and location sharing. No third parties or servers ever have your data.</li>
+<li>Situation display on both online and locally stored offline maps.</li>
+<li>Geospatial awareness calculations.</li>
+<li>Exchanging messages through encrypted QR-codes on paper, or through messages embedded directly in lxm:// links.</li>
+<li>Remote command and request functions, such as ping, signal reports and echo.</li>
+<li>Remote telemetry querying, with strong, secure and cryptographically robust authentication and control.</li>
+</ul>

metadata/en-US/short_description.txt

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+LSMF Client for e2ee messaging over Reticulum

metadata/en-US/title.txt

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+Sideband