Add CUPS print server container for Brother HL-4150CDN

assets/Brother HL-4150CDN/installer/README.md

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+# Step 1. Enter this command to extract the downloaded file:
+
+Command: `gunzip linux-brprinter-installer-*.*.*-*.gz`
+e.g. `gunzip linux-brprinter-installer-2.2.6-0.gz`
+
+# Step 2. Get superuser authorization with the "su" command or "sudo su" command.
+
+# Step 3. Run the tool:
+
+Command: `bash linux-brprinter-installer-*.*.*-* Brother machine name`
+e.g. `bash linux-brprinter-installer-2.1.1-1 HL-4150CDN`
+
+# Step 4. The driver installation will start. Follow the installation screen directions.
+ 
+ When you see the message "Will you specify the DeviceURI ?",
+
+ For USB Users: Choose N(No)
+ For Network Users: Choose Y(Yes) and DeviceURI number.
+
+The install process may take some time. Please wait until it is complete.