Docs - eavmlib: add needed include, ex_doc

Enables `rebar3 ex_doc` to succeed.

For version it seems to be manual replace in rebar.config eg:

sed -i "" "s/{version, .*}/{version, \"0.6.5\"}/" rebar.config && rebar3 ex_doc

Signed-off-by: Peter M <petermm@gmail.com>

libs/eavmlib/rebar.config

@@ -18,10 +18,18 @@
 % SPDX-License-Identifier: Apache-2.0 OR LGPL-2.1-or-later
 %
 
-{erl_opts, [debug_info]}.
+{erl_opts, [debug_info, {i, "../include"}]}.
 {deps, []}.
-{plugins, [rebar3_hex]}.
+{plugins, [rebar3_hex, rebar3_ex_doc]}.
 
 {shell, [
     {apps, [eavmlib]}
 ]}.
+{ex_doc, [
+    {version, "0.1.0"},
+    {source_url, "https://github.com/atomvm/AtomVM"},
+    {extras, []},
+    {main, "atomvm"},
+    {output, "doc"},
+    {api_reference, true}
+]}.