Add explanation

README.md

@@ -0,0 +1,16 @@
+# Experiment
+
+`target = {good, bad}`
+
+Run each experiment like:
+
+```
+cd ${target}
+mkdir build
+cd build
+cmake ..
+make
+```
+
+It will be ok for `good` and fail for `bad`.
+My situation is `bad`.