Add README with results, figures, and usage instructions

tau_blend=160

tau_blend=165

tau_blend=170

tau_blend=175

slope_gamma=1.20

slope_gamma=1.15

slope_gamma=1.10

slope_gamma=1.05 (fine-tune)

shrinkage=0.87

shrinkage=0.85 (re-tune with median r0)

r0 = median of last 3 residuals

r0 = median of last 5 residuals (more robust)

gamma_past=-3.2 (fine-tune)

tau_blend=180