Adds Screen Copy installation and usage.

scrcpy.sh

+#-----------------------------------------------------------------------
+# Install scrcpy.
+
+# For Debian/Ubuntu.
+sudo apt install ffmpeg libsdl2-2.0-0 adb wget \
+    gcc git pkg-config meson ninja-build libsdl2-dev \
+    libavcodec-dev libavdevice-dev libavformat-dev libavutil-dev \
+    libswresample-dev libusb-1.0-0 libusb-1.0-0-dev
+
+# Then clone the repo and execute the installation script (source).
+git clone https://github.com/Genymobile/scrcpy
+cd scrcpy
+./install_release.sh
+
+# When a new release is out, update the repo and reinstall.
+git pull
+./install_release.sh
+
+# To uninstall.
+sudo ninja -Cbuild-auto uninstall
+
+#-----------------------------------------------------------------------
+# Problem with scrcpy: "error: device unauthorized."
+# https://stackoverflow.com/questions/23081263/adb-android-device-unauthorized
+
+# It's likely that the device is no longer authorized on ADB for
+# whatever reason.
+
+# 1. Check if authorized.
+# 2. Revoke USB Debugging on phone. If the device is shown as
+#    unauthorized, go to the developer options on the phone and click
+#    "Revoke USB debugging authorization".
+# 3. Restart ADB Server.
+adb kill-server
+adb start-server
+
+# 4. Reconnect the device. The device will ask if you are agree to
+#    connect the computer id. You need to confirm it.
+# 5. Now Check the device. It is now authorized!
+
+#-----------------------------------------------------------------------
+# Same usages.
+#
+# Use Andriod as a webcam.
+# https://github.com/Genymobile/scrcpy/blob/master/doc/v4l2.md
+#
+# To record screen and audio.
+# https://github.com/Genymobile/scrcpy/blob/master/doc/recording.md