feat: add a manifest for guile

manifests/guile.scm

@@ -0,0 +1,14 @@
+(use-modules
+ (guix profiles)
+ (gnu packages guile)
+ (gnu packages guile-xyz)
+ (radix packages guile-xyz))
+
+(packages->manifest
+  (list guile-machine-code
+        guile-srfi-197
+        guile-quickcheck
+        guile-reader
+        guile-smc
+        slib))
+