doc: Improve instructions on README file (#4)

README.md

@@ -11,6 +11,34 @@ Compared to the AWS CLI, if no parameters are provided to the available
 commands, the user would be requested to choose the desired resource from a
 list of all tasks running on ECS.
 
+## Installation
+
+Clone the repository:
+
+```
+git clone https://github.com/sestrella/iecs.git
+```
+
+Download and [install](https://go.dev/dl/) the appropriate Go version. Check
+the version constraint on the [go.mod](go.mod) to determine which version to
+use.
+
+Compile and generate the binary:
+
+```
+go build
+```
+
+Copy the binary to a directory in the `PATH`, like `~/.local/bin`:
+
+```
+cp iecs ~/.local/bin/iecs
+```
+
+> [!NOTE]
+> Check that the path where the binary is copied exists in the `PATH`
+> environment variable.
+
 ## References
 
 - https://aws.github.io/aws-sdk-go-v2/docs/getting-started/

flake.nix

@@ -17,7 +17,7 @@
 
       systems = import systems;
 
-      perSystem = { system, pkgs, ... }: {
+      perSystem = { config, system, pkgs, ... }: {
         _module.args.pkgs = import nixpkgs {
           inherit system;
           overlays = [ gomod2nix.overlays.default ];
@@ -29,6 +29,10 @@
           src = ./.;
           modules = ./gomod2nix.toml;
         };
+
+        overlayAttrs = {
+          iecs = config.packages.default;
+        };
       };
     };
 }