Update README with protobuf related installation (#42)

Author: H-Huang

README.md

@@ -10,7 +10,7 @@ Easy Per Step Fault Tolerance for PyTorch
 </h3>
 
 <p align="center">
-  | <a href="https://pytorch-labs.github.io/torchft/"><b>Documentation</b></a> 
+  | <a href="https://pytorch-labs.github.io/torchft/"><b>Documentation</b></a>
   | <a href="https://github.com/pytorch-labs/torchft/blob/main/media/fault_tolerance_poster.pdf"><b>Poster</b></a>
   | <a href="https://docs.google.com/document/d/1OZsOsz34gRDSxYXiKkj4WqcD9x0lP9TcsfBeu_SsOY4/edit"><b>Design Doc</b></a>
   |
@@ -45,13 +45,32 @@ greatly improve efficiency by avoiding stop the world training on errors.
 
 ![](./media/torchft-overview.png)
 
-## Installation
+## Prerequisites
+
+Before proceeding, ensure you have the following installed:
 
-Before proceeding, ensure you have Rust installed on your system. Note that the Rust versions available in many conda environments may be outdated. To install the latest version of Rust, we recommend downloading it directly from the official website as shown in the below command:
+- Rust (with necessaray dependencies)
+- `protobuf-compiler` and the corresponding development package for Protobuf.
+
+Note that the Rust versions available in many conda environments may be outdated. To install the latest version of Rust, we recommend downloading it directly from the official website as shown in the below command:
 ```sh
 $ curl --proto '=https' --tlsv1.2 https://sh.rustup.rs -sSf | sh
 ```
 
+To install the required packages on a Debian-based system (such as Ubuntu) using apt, run:
+
+```sh
+sudo apt install protobuf-compiler libprotobuf-dev
+```
+
+or for a Red Hat-based system, run:
+
+```sh
+sudo dnf install protobuf-compiler protobuf-devel
+```
+
+## Installation
+
 ```sh
 $ pip install .
 ```