Added firmware package

MMDVMFirmware/default.nix

@@ -0,0 +1,33 @@
+{ stdenv, fetchFromGitHub, gcc-arm-embedded, ... }:
+
+stdenv.mkDerivation {
+  pname = "MMDVMFirmware";
+  version = "yolo";
+
+  src = fetchFromGitHub {
+    owner = "g4klx";
+    repo = "MMDVM";
+    rev = "c3246dbcb771c0f9ead3bbe40e78fba1bfe5debc";
+    sha256 = "sha256-UKhdSYvOZQNgOCjEOv+Q7cLB/+PrFQl8kKVkQOKrK5M=";
+    fetchSubmodules = true;
+  };
+
+  buildInputs = [ gcc-arm-embedded ];
+
+  buildPhase = ''
+    cat Makefile
+    make f4m
+  '';
+
+  installPhase = ''
+    runHook preInstall
+
+    mkdir -p $out/firmware
+    cp -v bin/* $out/firmware/
+
+    runHook postInstall
+  '';
+
+
+
+}