added quick README

README.md

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+### *insectDisease*: insect disease data from the USDA packaged as an R package
+
+
+### Install
+
+Install from GitHub using the code below. 
+
+```r
+
+# install.packages("devtools")
+devtools::install_github("viralemergence/insectDisease")
+library("insectDisease")
+```
+
+
+
+
+
+### vignettes
+
+The raw data can be called using the `data()` function on the various files within the `R` folder. In the `vignette` folder, there is some code that processes the data and organizes it as an edgelist for the three groups of parasites present in the data; protozoans, nematodes, and viruses. 
+
+
+