feat: add a idris manifest for when I get time to hack with it

manifests/idris.scm

@@ -0,0 +1,11 @@
+(use-modules
+ (guix profiles)
+ (gnu packages idris)
+ (gnu packages emacs-xyz))
+
+(packages->manifest
+  (list idris
+        idris-lightyear
+        idris-bifunctors
+        idris-lens))
+