LINKS.md added

LINKS.md

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+Useful links
+========================
+
+Linux boot
+------------------------
+
+* [Linux/x86 boot protocol](https://www.kernel.org/doc/Documentation/x86/boot.txt)
+
+Protected mode
+------------------------
+
+* [64-ia-32-architectures-software-developer-vol-3a-part-1-manual.pdf](http://www.intel.com/content/www/us/en/processors/architectures-software-developer-manuals.html)
+
+Serial programming
+------------------------
+
+* [8250 UART Programming](http://en.wikibooks.org/wiki/Serial_Programming/8250_UART_Programming#UART_Registers)
+* [Serial ports on OSDEV](http://wiki.osdev.org/Serial_Ports)