Add README with CentOS build information

diff --git a/README.CentOS.md b/README.CentOS.md
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+# Building on CentOS
+
+To build on CentOS:
+
+Install gcc and the kernel development package:
+
+```
+sudo yum -y install kernel-devel-`uname -r` gcc
+```
+
+Build with make:
+
+```
+make
+```
+
+and load the module with insmod:
+
+```
+sudo insmod nuc_led.ko
+```