Added readme.

README.md

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+# Coreboot Buildroot
+
+This repostory contains [buildroot](http://buildroot.uclibc.org/) configurations, patches, and addition meant to build a useful linux+busybox distribution which can be embedded on the eeprom of ThinkPad X220/X230 machines running [Coreboot](https://www.coreboot.org).
+
+It includes three different configuration: the default config `coreboot_defconfig`, a minimal config `coreboot_minimal_defconfig` which can fit on the X230 without hardware modifications (but lacks some extra goodies), and a grsec configuration for both of these.
+
+$ git clone https://github.com/xsmurf/coreboot_buildroot_project.git
+$ export BR_PROJECT=$PWD/coreboot_buildroot_project
+$ wget <buildroot-release.tgz>
+$ tar -xjf <buildroot-release.tgz>
+$ cd <buildroot-release>
+$ make BR2_EXTERNAL=$BR_PROJECT coreboot_defconfig
+$ make
+
+After making changes in buildroot with `make menuconfig`, `make linux-menuconfig`, or `make busybox-menuconfig`, you use the included `$BR_PROJECT/scripts/save.sh` to export your changes back to the project.