Add preliminary README

Author: Rot127

README.md

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+# BAP emulation trace generator
+
+This QEMU fork implements the TCG plugin to generate execution traces in the
+[bap-frame](https://github.com/BinaryAnalysisPlatform/bap-frames) format.
+
+Previous traces were generated with a patched QEMU.
+You can find these in the branches tracewrap-6.2.0 for ARM and x86 and tracewrap-8.1 for Hexagon.
+
+## Building
+
+```bash
+mkdir build
+cd build
+# See `../configure --help` for a list of targets.
+../configure --enable-plugins --target-list=<target>
+make
+```