add lisp packages

lisp/org/testing/examples/property-inheritance.org

@@ -0,0 +1,25 @@
+#+property: header-args :var  foo=1
+#+property: header-args+ :var bar=2
+
+#+begin_src emacs-lisp
+  (+ foo bar)
+#+end_src
+
+* overwriting a file-wide property
+  :PROPERTIES:
+  :header-args: :var foo=7
+  :END:
+
+#+begin_src emacs-lisp
+  foo
+#+end_src
+
+* appending to a file-wide property
+  :PROPERTIES:
+  :header-args+: :var baz=3
+  :END:
+
+#+begin_src emacs-lisp
+  (+ foo bar baz)
+#+end_src
+