Added README & sample .env

.env_sample

@@ -0,0 +1,2 @@
+export DRIVE=/dev/nvme0n1
+export PASSPHRASE='PASSWORD'

readme.md

@@ -1,5 +1,49 @@
-Install requirements
+# Nil Install Guide
 
-- git 
-- make
+This is the nix configuration for a 2021 Thinkpad T14 AMD g2 machine named `nil`.
 
+The boot media looks like
+
+```
+NAME                          TYPE     MOUNTPOINT
+nvme0n1                       disk
+├─nvme0n1p1                   part     /boot
+└─nvme0n1p2                   part
+  └─crypt                     crypt    /dev/mapper/root
+    └─partitions              lvm
+      ├─swap                  swap     /dev/partitions/swap
+      └─lvm_root              lvm      /dev/partitions/lvm_root
+        └─rpool               zpool
+          ├─rpool/root        zfs
+          ├─rpool/root/nixos  zfs      /
+          └─rpool/home        zfs      /home
+```
+
+## Install
+
+A makefile is used for ease of use. To set this up on a new machine you will need the following:
+
+```bash
+nix-env -iA nixos.gnumake
+nix-env -iA nixos.git
+```
+
+then checkout this repo, create & modify the `.env` file
+
+```bash
+git clone https://git.jpatrick.io/james/nil.git /tmp/install
+cd /tmp/install
+cp .env_sample .env
+```
+
+Once you have set the `PASSPHRASE` & `DISK` vars run
+
+```bash
+sudo make nix_install
+```
+
+## TODO
+
+- Document setting the `networking.hostId` variable.
+- Use [NixOS Hardware](https://github.com/NixOS/nixos-hardware) Modules.
+- Fix wireless driver issue :: This uses the Realtek 8852AE 802.11AX WWAN.