Create README.md

Signed-off-by: Clifford Wolf <clifford@clifford.at>
Signed-off-by: Tim 'mithro' Ansell <mithro@mithis.com>

README.md

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+Project X-Ray
+=============
+
+Documenting the Xilinx 7-series bit-stream format.
+
+Quickstart Guide:
+-----------------
+
+Always make sure to set the environment for the device you are working on before
+running any other commands:
+
+    source database/artix7/settings.sh
+
+Creating HTML documentation:
+
+    cd htmlgen
+    python3 htmlgen
+
+(Re-)creating parts of the database, for example LUT init bits:
+
+    cd fuzzers/010-lutinit
+    make
+    make pushdb