doc: Add Guix Home documentation.

* doc/guix.texi: Add Guix Home documentation.
* doc/he-config-bare-bones.scm: New file.

Signed-off-by: Oleg Pykhalov <go.wigust@gmail.com>

doc/he-config-bare-bones.scm

@@ -0,0 +1,24 @@
+(use-modules (gnu home)
+             (gnu home-services)
+             (gnu home-services shells)
+             (gnu services)
+             (gnu packages admin)
+             (guix gexp))
+
+
+(home-environment
+ (packages (list htop))
+ (services
+  (list
+   (service home-bash-service-type
+            (home-bash-configuration
+             (guix-defaults? #t)
+             (bash-profile '("\
+export HISTFILE=$XDG_CACHE_HOME/.bash_history"))))
+
+   (simple-service 'test-config
+                   home-files-service-type
+                   (list `("config/test.conf"
+                           ,(plain-file "tmp-file.txt"
+                                        "the content of ~/.config/test.conf")))))))
+