add readme back

README.md

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+glmgen
+======
+
+Generalized lasso implementations. To install the
+R library directly from github, run the following from R:
+
+```{r}
+ library(devtools)
+ install_github("statsmaths/glmgen", subdir="R_pkg/glmgen")
+```
+
+See the C documentation published at [c docs](http://statsmaths.github.io/glmgen/html/files.html),
+and the R documentation published at [R docs](http://statsmaths.github.io/glmgen/glmgen-manual.pdf).