Update 'Build Qt5.12.10 for RPI3 X11 and EGLFS'

Build-Qt5.12.10-for-RPI3-X11-and-EGLFS.md

@@ -1,3 +1,36 @@
+#### Build Qt5.12.10 for RPI3 X11 and EGLFS
+1. Get the source code from:
+https://download.qt.io/official_releases/qt/5.12/5.12.10/
+
+2. Uncomment developement source in 
+```
+sudo nano /etc/apt/sources.list
+```
+3. Install these packages on the rpi
+```
+sudo apt-get build-dep qt4-x11
+sudo apt-get build-dep libqt5gui5
+sudo apt-get install libudev-dev libinput-dev libts-dev libxcb-xinerama0-dev libxcb-xinerama0\
+
+sudo apt-get build-dep qt5-default
+sudo apt-get install libiconv-hook-dev libinput-dev libts-dev bluez libbluetooth-dev libgstreamer1.0-dev libegl1-mesa
+sudo apt-get install "^libxcb.*" libx11-xcb-dev libglu1-mesa-dev libxrender-dev libatspi2.0-dev libdbus-1-dev
+```
+4. [on RPi] For bluetooth support install 
+```
+Apt install libbluetooth-dev bluetooth blueman bluez libusb-dev libdbus-1-dev bluez-hcidump bluez-tools
+```
+5. [on RPi] For Gstreamer1.0 support
+```
+sudo apt-get install gstreamer1.0-omx libgstreamer1.0-dev libgstreamer-plugins-base1.0-dev
+```
+6. [on RPi] Prepare our target directory
+```
+sudo mkdir /usr/local/qt5pi
+sudo chown pi:pi /usr/local/qt5pi
+```
+7. 
+
 build configuration:
 ```
 ../configure -release -no-eglfs -qt-xcb -xcb -nomake tests -nomake examples -skip wayland -skip qtscript -skip qtwebengine \