Updating build from source instructions (GoogleCloudPlatform#1152)

* Updating build from source instructions

* Updating the doc

* Updating the doc

Author: darshan-sj

docs/install.md

@@ -94,8 +94,13 @@ Building from source is only supported for MacOS and Linux based platforms.
     Required go version: 1.22.7+
 2. Install nodejs ([download](https://nodejs.org/en/download)). <br/>
     Required node version: v18.20.6+
-
-3. Run the following commands to clone the repository and build it from source:
+3. Install angular-cli ([instructions](https://angular.dev/tools/cli/setup-local#install-the-angular-cli))
+4. Install `gcc`, `g++` and `make` using the command -
+```sh
+sudo apt update
+sudo apt install build-essential
+```
+5. Run the following commands to clone the repository and build from source:
 
 ```sh
 git clone https://github.com/GoogleCloudPlatform/spanner-migration-tool