docs: add commands example

examples/project-commands/Hello.avdl

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+protocol Hello {
+    record Hello {
+        string message;
+        int timestamp;
+    }
+}

examples/project-commands/README.md

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+# project-commands
+
+This example shows how to create scripts for your project, by leveraging [mission-control](https://github.com/Platonic-Systems/mission-control)
+
+This is a **potential** alternative to:
+
+- Using a `Makefile` to manage your project's scripts
+- Using the popular [Scripts To Rule Them All](https://github.com/github/scripts-to-rule-them-all) approach (having a `scripts/` folder)
+- Using a `bin/` folder
+
+## Explanation
+
+In this example we use the [avro-tools](https://avro.apache.org/) to convert our scripts from `.avdl` to `.avsc`.
+
+You don't need to know anything about avro to understand mission-control and use this example (that's nix baby 🚀).
+
+When setting up [mission-control](https://github.com/Platonic-Systems/mission-control), we add
+one script called `build`. Because of `wrapperName = "run";`, once we open the shell created by nix,
+the commands will be listed as `run build`.
+
+mission-control depends on flake-root, which also exposes the helpful `$FLAKE_ROOT` variable.
+
+After creating the scripts, we need to pass the newly created scripts to the desired shell, in this example we use the default shell.
+
+## Usage
+
+> **Warning**
+> If you copy the flake.nix remember to add it to git, otherwise it won't work
+
+Run:
+
+```sh
+nix develop
+```
+
+And mission-control will print in the new shell the available commands (you should see only one).
+
+Try running
+
+```sh
+run build
+```

examples/project-commands/flake.nix

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+{
+  description = "Description for the project";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+
+    mission-control.url = "github:Platonic-Systems/mission-control";
+    flake-root.url = "github:srid/flake-root";
+  };
+
+  outputs = inputs@{ flake-parts, ... }:
+    flake-parts.lib.mkFlake { inherit inputs; } {
+      imports = [
+        inputs.mission-control.flakeModule
+        inputs.flake-root.flakeModule
+      ];
+      systems = [ "x86_64-linux" "aarch64-darwin" "x86_64-darwin" ];
+      perSystem = { config, self', inputs', pkgs, system, ... }: {
+        devShells.default = pkgs.mkShell {
+          nativeBuildInputs = with pkgs; [ avro-tools ];
+          inputsFrom = [ config.mission-control.devShell config.flake-root.devShell ];
+        };
+        mission-control = {
+          wrapperName = "run";
+          scripts = {
+            build = {
+              description = "convert files from .avdl to .avsc";
+              exec = ''
+                avro-tools idl2schemata "$FLAKE_ROOT/Hello.avdl" .
+              '';
+              category = "Development";
+            };
+          };
+        };
+      };
+    };
+}