Merge pull request 'implement quickstart' (#215) from Mic92-main into main

docs/quickstart.md

@@ -0,0 +1,61 @@
+# Initializing a New Clan Project
+
+## Clone the Clan Template
+
+To start a new project, execute the following command to clone the Clan Core template:
+
+```bash
+$ nix flake init -t git+https://git.clan.lol/clan/clan-core
+```
+
+This action will generate two primary files: `flake.nix` and `.clan-flake`.
+
+```bash
+$ ls -la
+drwx------ joerg users   5 B  a minute ago   ./
+drwxrwxrwt root  root  139 B  12 seconds ago ../
+.rw-r--r-- joerg users  77 B  a minute ago   .clan-flake
+.rw-r--r-- joerg users 4.8 KB a minute ago   flake.lock
+.rw-r--r-- joerg users 242 B  a minute ago   flake.nix
+```
+
+### Understanding the .clan-flake Marker File
+
+The `.clan-flake` marker file serves an optional purpose: it helps the `clan-cli` utility locate the project's root directory.
+If `.clan-flake` is missing, `clan-cli` will instead search for other indicators like `.git`, `.hg`, `.svn`, or `flake.nix` to identify the project root.
+
+---
+
+# Migrating Existing NixOS Configuration Flake
+
+## Integrating with Existing NixOS Machines
+
+If you already manage NixOS machines using a flake, you can integrate them with the clan-core as shown in the example below:
+
+```nix
+{
+  description = "My custom NixOS flake";
+
+  inputs.clan-core.url = "git+https://git.clan.lol/clan/clan-core";
+
+  outputs = { clan-core, ... }: {
+    nixosConfigurations = clan-core.lib.buildClan {
+      directory = ./.;
+      machines = {
+        turingmachine = {
+          nixpkgs.pkgs = nixpkgs.legacyPackages.aarch64-linux;
+          imports = [
+            ./configuration.nix
+          ];
+        };
+      };
+    };
+  };
+}
+```
+
+In this configuration:
+
+- `description`: Provides a brief description of the flake.
+- `inputs.clan-core.url`: Specifies the Clan Core template's repository URL.
+- `nixosConfigurations`: Defines NixOS configurations, using Clan Core’s `buildClan` function to manage the machines.