dbeaver/dbeaver-devops#2324 add link to gh releases and instructions for installing from source code

Author: flambchap

README.md

@@ -5,10 +5,19 @@ as well as helps with installing relevant dependencies.
 
 ## Product installation
 
-1. Download the executable and place it in a directory of your choice.
+### Using pre-built executable
+
+1. [Download the executable](https://github.com/dbeaver/dbeaver-server-installer/releases) and place it in a directory of your choice.
 2. Add the directory to your system's PATH environment variable.
 3. Optional: install shell completions for your shell (see below).
 
+### From source code
+
+1. Ensure you have [Go](https://go.dev/dl/) installed. You can find the minimum required version of Go in the `go.mod` file.
+2. Execute `go install github.com/dbeaver/dbeaver-server-installer@latest`.
+
+For more information about this installation method, see the [Go documentation](https://go.dev/ref/mod#go-install).
+
 ## Supported commands
 
 To see the list of available commands, run `dbeaver-server-installer --help`.