Create build_raspberrypi3_with_buildroot.md

build_raspberrypi3_with_buildroot.md

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+basis:
+======
+
+from: https://code4pi.fr/2014/03/creation-dune-custom-image-pour-votre-raspberry-pi/#more-470
+
+downmload last buildroot version:
+```
+git clone http://git.buildroot.net/buildroot
+# or 
+git clone git://git.busybox.net/buildroot
+cd buildroot
+make raspberrypi3_defconfig
+#make menuconfig
+make -j8
+```
+
+Now the kernel and all that is needed to sater has been created in ```output``` and the bases if images is set in ```output/image```
+
+Now we need to install toolchain and basis headers:
+
+```
+
+```