Create README.md

Author: innesbre

README.md

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+# AgingMouseBrainCCInx
+
+## Usage
+This is an R package used to explore the cell-cell interaction predictions from the 
+paper "Single-cell transcriptomic profiling of the aging mouse brain". The
+package contains an RData list object with both the edge list and node 
+metadata of predicted cell-cell interactions between cell types in the mouse
+brain, and their changes with aging.  The predictions were generated using 
+CCInx (baderlab.github.io/CCInx). You can install this package in R by running:
+```{r}
+install.packages("devtools")
+devtools::install_github("BaderLab/AgingMouseBrainCCInx")
+```
+It takes a while for this command to run, since data files are larger than your usual github code. You only need to run this installation step the first time you use this package on your computer.
+
+Then the data can be viewed in the [*CCInx*](https://baderlab.github.io/CCInx) Shiny app by running:
+```{r}
+library(AgingMouseBrainCCInx)
+ViewAgingMouseBrainCCInx()
+```