Update README.md

README.md

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 `confunnel` is a Stata command implementing contour enhanced funnel plots for meta-analysis (Peters et al., 2008). It was distributed in the Stata Journal (Palmer et al., 2008).
 
+## Installation
+To install, issue in Stata (in versions 13 and above):
+```
+net install bpbounds, from(https://raw.github.com/remlapmot/confunnel-stata/master/)
+```
+
 ## References
 - Palmer, T. M., J. L. Peters, A. J. Sutton, and S. G. Moreno. 2008.  Contour enhanced funnel plots for meta-analysis. Stata Journal, 8: 242-254.
 - Peters, J. L., A. J. Sutton, D. R. Jones, K. R. Abrams, and L. Rushton.  2008. Contour-enhanced meta-analysis funnel plots help distinguish publication bias from other causes of asymmetry. Journal of Clinical Epidemiology. 61: 991-996.