Update README.md (#2238)

* Add renv and docker sections to readme
* Update README.md

Author: immanuelazn

README.md

@@ -55,6 +55,69 @@ ArchR::installExtraPackages()
 ```
 If any of these steps fails, you should identify the offending package and troubleshoot that individual installation before proceeding. Additionally, please see the ArchR website (www.ArchRProject.com) where we have installation troubleshooting tips.
 
+# Pre-compiled ArchR environment
+We provide two methods in which a user can manage R dependencies.  
+
+### Using renv to manage dependencies
+The first is by using renv to manage a project's dependencies. To utilize this, make sure that the renv package is installed and loaded.  Before you are ready to use `renv`, you must ensure that you are working on the same R version that we used for the provided renv environment. 
+The R versions we currently support are:
+```
+- R 4.4
+- R 4.1
+```
+Secondly, make sure that the renv package is installed and loaded.
+```
+install.packages("renv")
+library(renv)
+```
+Set a working directory for your project
+```
+dir.create(path = "./<project_name>", showWarnings = FALSE)
+setwd("./<project_name>")
+```
+Then, lets download the lock file for the current master branch of ArchR.
+For R 4.4:
+```
+download.file(url = "https://pub-9ae435458ecc412abbbc9420a502ec38.r2.dev/renv.lock", destfile = "./renv.lock")
+```
+For R 4.1:
+```
+download.file(url = "https://pub-9ae435458ecc412abbbc9420a502ec38.r2.dev/renv_4_1.lock", destfile = "./renv.lock")
+```
+
+Now, we can initiate our renv project environment, utilizing the renv.lock to bootstrap a new renv environment.
+```
+renv::init()
+```
+
+### Using Docker to manage dependencies
+We also provide Docker images, built off of `rocker/rstudio`, that already have ArchR and all dependencies pre-loaded.
+
+The latest version can be found at:
+```
+greenleaf/archr:latest
+```
+and other versions, including images built with differing R versions, can be found at:
+```
+https://hub.docker.com/r/greenleaflab/archr/tags
+```
+
+To utilize these images, the user can first install Docker as mentioned in their [documentation](https://docs.docker.com/engine/install/ubuntu/#install-using-the-repository)
+
+Following, create a container using the following command:
+```
+docker image pull immanuelazn/archr:latest
+docker run -it --rm -v <your_workspace>:/workspace -p <your_port_of_interest>:8787
+```
+This will spin up a container that has Rstudio turned on by default. Rstudio can be accessed through:
+```
+localhost:<your_port_of_interest>
+```
+If you would like an interactive bash console instead, the following command can instead be called:
+```
+docker run -it --rm -v <your_workspace>:/workspace -p <your_port_of_interest>:8787 bash
+```
+
 # Issues using ArchR?
 
 ArchR is currently in __beta__. We expect there to be bumps in the road. If you think you have found a bug, please first install the latest version of ArchR via