Update README.md (#46)

README.md

diff --git a/README.md b/README.md
index a59f12d..9c764b7 100644
--- a/README.md
+++ b/README.md
@@ -77,6 +77,12 @@
   externals/torch-mlir/externals/llvm-project/llvm
 ```
 
+To speed up the build process, you can set up [ccache](https://ccache.dev/download.html) and add the following flags to the command above:
+
+```shell
+-DCMAKE_C_COMPILER_LAUNCHER=ccache -DCMAKE_CXX_COMPILER_LAUNCHER=ccache
+```
+
 Run the following to ensure the MPACT compiler builds and runs correctly.
 
 ```shell