Add a Motivation section in README to explain the problem solved by CLP IR.
#27
| Job | Run time |
|---|---|
| 36s | |
| 29s | |
| 1m 7s | |
| 52s | |
| 1m 16s | |
| 53s | |
| 1m 13s | |
| 1m 13s | |
| 7m 39s |