Add readme

README.md

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+## Usage
+```
+mkdir build
+cd build
+cmake .. -DDynamoRIO_DIR=[path to directory that contains DynamoRIOConfig.cmake]
+ccmake . # Optional: configure build options
+cmake --build . -j$(nproc)
+```
+The `dram_tracer_launcher` is an offline tool that operates on DrCacheSim trace files:
+```
+./dram_tracer_launcher -trace_dir [path to trace directory]
+```
+For online usage (needed for physical address conversion), the tool has to be integrated into the DrCacheSim source code. A DynamoRIO fork is provided.
+To trace an application run the following command in the DynamoRIO build directory:
+```
+sudo ./drrun -t drcachesim -simulator_type dram_tracer -use_physical -- [application]
+```
+System priviledges are needed for the physical address conversion.