Create README.md

bin/scm/README.md

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+The scheme backend is built with Nix! First install nix:
+```bash
+curl --proto '=https' --tlsv1.2 -sSf -L https://install.determinate.systems/nix | sh -s -- install
+```
+Here's an example `shell.nix` which has `kind-scm` available to use:
+```nix
+{ pkgs ? import <nixpkgs> {} }:
+let
+  kind_legacy = pkgs.fetchFromGitHub {
+    owner = "rigille";
+    repo = "Kind-Legacy";
+    rev = "2c5a96868296aeeed5260e9732ff7b052d0e9d43";
+    sha256 = "28c8325659e6d5883c604552e67470e09a59bd16156fa7f1e7e11623d36d62ad";
+  };
+  kind_scm = import "${kind_legacy}/bin/scm" { pkgs=pkgs; };
+in
+pkgs.mkShell {
+  buildInputs = [
+    kind_scm
+  ];
+}
+```
+Alternatively you can run `nix-env --file default.nix --install` and install `kind-scm` globally on your system.