Add COPYING and README

COPYING

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+(The “MIT License”)
+
+With the exceptions below, all files are
+Copyright (c) 2008 Nelson Elhage
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+
+=====================================================================
+tests/bench[1-4].uasm, tests/os.uasm, tests/sancheck.uasm,
+tests/litmus.uasm, tests/beta.uasm are modified from 6.004 soure code
+available from http://web.mit.edu/6.004/bsim/
+
+uasm/uasm.c is modified from uasm.c available at
+http://web.mit.edu/6.004/src/posix-src/uasm/

README

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+This code implements a working Just-In-Time binary translator from the
+Beta [1] processor to the i386. It supports clock and keyboard
+interrupts, and correctly executes lab6.uasm, bench[1-4].uasm, and
+litmus.uasm, as well as Lab 8's operating system [2].
+
+This source is canonically available as a git tree from
+http://nelhage.com/git/bemu.git/, or as a tarball from
+http://nelhage.com/files/bemu.tgz (not guaranteed to be up-to-date)
+
+It should work on just about any modern Linux system; I've tested it
+on Athena and it works fine there.
+
+To run the self-tests, `make test'; To run the lab8 OS, `make
+run-lab8'.
+
+It alsos includes a somewhat hacked version of `uasm' from
+http://web.mit.edu/6.004/src/posix-src/uasm/, modified to deal with
+relative includes slightly better, and to support arbitrary-sized
+ROMs.
+
+[1] http://6004.csail.mit.edu/currentsemester/handouts/beta.pdf
+[2] http://web.mit.edu/6.004/bsim/lab8.uasm