Add profile.d/default to the default requirements

projects/cram/README.md

@@ -31,3 +31,5 @@ Cram reads a config dir with three groups of packages
 - `hosts.d/<hostname>` contains one package for each host, and should pull in a list of profiles.
 
 The intent of this tool is to keep GNU Stow's intuitive model of deploying configs via symlinks, and augment it with a useful pattern for talking about "layers" / "packages" of related configs.
+
+Cram installs the package `hosts.d/$(hostname)`, and `profiles.d/default` by default.

projects/cram/src/python/cram/__main__.py

@@ -96,7 +96,10 @@ def main():
     hostname = os.uname()[1]
 
     # Compute the closure of packages to install
-    requirements = [f"hosts.d/{hostname}"]
+    requirements = [
+        f"hosts.d/{hostname}",
+        "profiles.d/default",
+    ]
 
     for r in requirements:
         try: