📝 Add short documentation about the initial installation

README.md

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+# NixOS Configuration
+
+## Initial Framework 16 Setup
+
+1. Create LUKS key files for all Yubikeys by following the first 3 steps of [this guide](https://github.com/sgillespie/nixos-yubikey-luks)
+  - Attention: only run step 1) `ykpersonalize -2 -ochal-resp -ochal-hmac` if it's a new Yubikey or if you are sure that slot 2 is not used! You may loose access to existing devices otherwise
+  - use the same salt for all keys
+  - store a file with the content of the LUKS_KEYS variable
+2. Configure the `disko.nix` file to match your system.
+3. Run the NixOS installer, copy the files to /tmp
+   ```bash
+   cp -r yk /tmp/yk # contains the keys
+   cp disko.nix /tmp/disko.nix
+   ```
+4. Run disko
+    ```bash
+    nix --experimental-features "nix-command flakes" run github:nix-community/disko -- --mode disko /tmp/disko.nix
+    ```
+5. Copy the salt's to the unencrypted partition
+    ```bash
+    mkdir /mnt/boot/crypt-storage
+    mkdir /mnt/backup-esp/crypt-storage
+    cp yk/yk_salt /mnt/boot/crypt-storage/default
+    cp yk/yk_salt /mnt/backup-esp/crypt-storage/default
+    ```
+6. Copy the configuration files
+    ```bash
+    cp configuration.nix /mnt/etc/nixos/configuration.nix
+    cp disko.nix /mnt/etc/nixos/disko.nix
+    cp hardware-configuration.nix /mnt/etc/nixos/hardware-configuration.nix
+    ```
+7. Run `nixos-install`
+