fwupd: added

wiki/linux/fwupd.md

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+# fwupd
+
+[fwupd](https://fwupd.org/) is a daemon for managing and installing firmware
+updates on Linux based operating systems.
+It is mainly used for UEFI firmware and supported devices.
+
+## Setup
+
+fwupd can be installed on most distributions by installing the
+`fwupd` package.
+
+## Usage
+
+The following commands describe the basic usage of an update process using
+fwupd.
+
+First the devices updatable by fwupd can be checked.
+
+```sh
+fwupdmgr get-devices
+```
+
+Afterwards the latest metadata can be downloaded by the following command.
+
+```sh
+fwupdmgr refresh
+```
+
+The updates can the be listed.
+
+```sh
+fwupdmgr get-updates
+```
+
+Finally the updates can be installed.
+
+```sh
+fwupdmgr update
+```