feat(assign1): add basic "Hello World" program

assign1/c-programs/hello.c

@@ -0,0 +1,8 @@
+#include <stdio.h>
+
+int main() {
+  printf("Welcome to OwlTech Industries!\n");
+  printf("Systems Programming Division\n");
+
+  return 0;
+}

assign1/default.nix

@@ -0,0 +1,12 @@
+{
+  assign1-hello = { stdenv }:
+    stdenv.mkDerivation {
+      name = "hello";
+      src = ./.;
+      buildPhase = "gcc c-programs/hello.c -o hello";
+      installPhase = ''
+        mkdir -p $out/bin
+        install hello $out/bin/hello
+      '';
+    };
+}