Update icons (#1545)

src/assets/linux/README.md

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+# Mattermost Desktop for Linux
+
+## Table of Contents
+
+- [Install](#install)
+- [User Guide](#user-guide)
+- [Contributing](#contributing)
+- [License](#license)
+
+
+## Install
+
+If you installed the application via a package manager, it's ready to use in your system. Please follow the [User Guide](#user-guide) for further information.
+
+Otherwise, first locate the extracted directory in your desired directory (e.g. `/opt/mattermost-desktop-<VERSION>`) and follow the steps below.
+
+### Desktop launcher
+
+Execute the script file to create a `Mattermost.desktop` file.
+
+```
+/opt/mattermost-desktop-<VERSION>/create_desktop_file.sh
+```
+
+Then move it to the appropriate directory of your desktop environment. For example, on Ubuntu Unity it's `~/.local/share/applications/` for the current user.
+
+```
+mv Mattermost.desktop ~/.local/share/applications/
+```
+
+### Terminal command
+
+Set a `PATH` environment variable to enable launching from the terminal. For example, you can append the following line into `~/.bashrc`.
+
+```sh
+# assuming that /opt/mattermost-desktop-<VERSION>/mattermost-desktop is the executable file.
+export PATH=$PATH:/opt/mattermost-desktop-<VERSION>
+```
+
+Alternatively, you can also create a symbolic link for the application.
+
+```sh
+sudo ln -s /opt/mattermost-desktop-<VERSION>/mattermost-desktop /usr/local/bin/
+```
+
+You're now all set! See the [User Guide](#user-guide) below for instructions.
+
+
+## User Guide
+
+After launching, you need to configure the application to interact with your team.
+
+1. If you don't see a page titled "Settings", select **File** > **Settings...** from the menu bar.
+2. Click **Add new team** next to the right of Team Management section.
+3. Enter **Name** and a valid **URL**, which begins with either `http://` or `https://`.
+4. Click **Add**.
+5. Click **Save**.
+
+More guides are available at [Mattermost Documentation](https://about.mattermost.com/default-desktop-app-documentation/).
+
+
+## Contributing
+
+See [contributing guidelines](https://github.com/mattermost/desktop/blob/master/CONTRIBUTING.md) for reporting bugs, features or submitting pull requests.
+
+
+## License
+
+Apache License, Version 2.0

src/assets/linux/create_desktop_file.sh

@@ -0,0 +1,18 @@
+#!/bin/sh
+set -e
+WORKING_DIR=`pwd`
+THIS_PATH=`readlink -f $0`
+cd `dirname ${THIS_PATH}`
+FULL_PATH=`pwd`
+cd ${WORKING_DIR}
+cat <<EOS > Mattermost.desktop
+[Desktop Entry]
+Name=Mattermost
+Comment=Mattermost Desktop application for Linux
+Exec="${FULL_PATH}/mattermost-desktop"
+Terminal=false
+Type=Application
+Icon=${FULL_PATH}/app_icon.png
+Categories=Network;InstantMessaging;
+EOS
+chmod +x Mattermost.desktop