Create README.md

Author: zachs18

Diff for: README.md

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+# realmodetesting
+Messing around with 16-bit real mode code.
+
+Builds on linux with build-essential, cmake.
+
+Runs on with qemu-system-i386.
+
+Usage:
+
+    mkdir build
+    cd build
+    cmake ..
+    make
+    make run