added and tested the template

On my tuxedo laptop with a hosted guix on an Ubuntu derivative the
configure script found the host guile version which lead to loading
incompatible bytecode of the guix provided libraries. Updated the
README.

.envrc

@@ -1,2 +0,0 @@
-use guix
-

README.md

@@ -27,6 +27,16 @@ make -j$(nproc)
 After the build system is initialized, only `make` needs to be run to
 recompile the Scheme modules.
 
+Note: On hosted guix the configure script might find the host guile version
+instead of the guix provided one. This can lead to incompatible bytecode errors.
+To force to use a consistent guile use
+
+```
+./configure GUILE=$(which guile)
+```
+
+to ensure the right version is configured.
+
 ## Running the game
 
 To run the game from the source checkout, use the `pre-inst-env` wrapper script:

manifest.scm

@@ -1,6 +0,0 @@
-;; What follows is a "manifest" equivalent to the command line you gave.
-;; You can store it in a file that you may then pass to any 'guix' command
-;; that accepts a '--manifest' (or '-m') option.
-
-(specifications->manifest
-  (list "guile-chickadee"))