Add creating md backend spec to docs

org-glossary.org

@@ -576,3 +576,29 @@ to avoid the =\ifnum%n>0= LaTeX switch.
 
 This allows for any change in other backends or the defaults you're not
 particularly attached to from freely updating.
+
+** Adding a new export backend
+
+Adding a new export spec is as easy as pushing a spec list to
+~org-glossary-export-specs~, for example should we want to add an =ox-md= backend we
+could do this:
+
+#+begin_example
+(push '(md (t :use "[%t](#gls-%K)"
+              :definition "%t {#gls-%K}"
+              :definition-structure "%d\n\\colon{} %v [%n uses]\n"))
+      org-glossary-export-specs)
+#+end_example
+
+We need to remember to use =\colon{}= instead of =:= to avoid it being interpreted
+as Org fixed-width syntax.
+
+Alternatively, we could use ~org-glossary-set-export-spec~, which has the
+advantage of being idempotent, and I would argue a little clearer.
+
+#+begin_example
+(org-glossary-set-export-spec 'md t
+  :use "[%t](#gls-%K)"
+  :definition "%t {#gls-%K}"
+  :definition-structure "%d\n\\colon{} %v [%n uses]\n")
+#+end_example

org-glossary.texi

@@ -60,6 +60,7 @@ Export configuration
 * Structure of an export template set::
 * Creating a new glossary type::
 * Tweaking specific exports::
+* Adding a new export backend::
 
 @end detailmenu
 @end menu
@@ -526,6 +527,7 @@ the use, when @code{org-glossary-display-substitute-value} is non-nil.
 * Structure of an export template set::
 * Creating a new glossary type::
 * Tweaking specific exports::
+* Adding a new export backend::
 @end menu
 
 @node Setting export parameters
@@ -765,4 +767,31 @@ to avoid the @samp{\ifnum%n>0} @LaTeX{} switch.
 This allows for any change in other backends or the defaults you're not
 particularly attached to from freely updating.
 
+@node Adding a new export backend
+@section Adding a new export backend
+
+Adding a new export spec is as easy as pushing a spec list to
+@code{org-glossary-export-specs}, for example should we want to add an @samp{ox-md} backend we
+could do this:
+
+@example
+(push '(md (t :use "[%t](#gls-%K)"
+              :definition "%t @{#gls-%K@}"
+              :definition-structure "%d\n\\colon@{@} %v [%n uses]\n"))
+      org-glossary-export-specs)
+@end example
+
+We need to remember to use @samp{\colon@{@}} instead of @samp{:} to avoid it being interpreted
+as Org fixed-width syntax.
+
+Alternatively, we could use @code{org-glossary-set-export-spec}, which has the
+advantage of being idempotent, and I would argue a little clearer.
+
+@example
+(org-glossary-set-export-spec 'md t
+  :use "[%t](#gls-%K)"
+  :definition "%t @{#gls-%K@}"
+  :definition-structure "%d\n\\colon@{@} %v [%n uses]\n")
+@end example
+
 @bye