Update README.md to include installation instructions

README.md

@@ -12,6 +12,28 @@ WebGestaltR function can perform popular enrichment analyses: ORA (Over-Represen
 ## Installation
 
 
+---
+
+### Requirements
+
+- R (>= 4.0.0)
+- Rust (>= 1.63.0)
+
+---
+
+Since WebGestaltR v1.0.0, Rust is used for core computations in the R package. Therefore, to install WebGestaltR, please download and install Rust from [https://www.rust-lang.org/tools/install](https://www.rust-lang.org/tools/install). For Mac, Linux, or Unix users, Rust can be installed from the command line, and Windows users can download a GUI installer.
+
+Make sure you restart your terminal after installing Rust to ensure the Rust compiler is available in your path. You can check that Rust is installed correctly by running `rustc --version` in your terminal.
+
+After installing Rust, you can install WebGestaltR by running the following command in an R session:
+
+```R
+# install.packages("devtools") # run if devtools not already installed
+devtools::install_github("bzhanglab/WebGestaltR")
+```
+
+During installation, the Rust compiler will be called to build the computation library used by WebGestaltR. If you run into problems with installation of the new version, please [open a new issue](https://github.com/bzhanglab/WebGestaltR/issues/new/choose).
+
 
 ## Changes