Added simple docs sketch

esp_modem/docs/conf.py

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+# -*- coding: utf-8 -*-
+#
+# English Language RTD & Sphinx config file
+#
+import os
+import os.path
+import re
+import subprocess
+import sys
+
+# General information about the project.
+project = u'ESP-MODEM Documentation'
+copyright = u'2016 - 2021, Espressif Systems (Shanghai) Co., Ltd'
+
+# The language for content autogenerated by Sphinx. Refer to documentation
+# for a list of supported languages.
+language = 'en'
+
+extensions = ['breathe' ]
+
+breathe_projects = {'esp_modem': 'xml'}
+
+breathe_default_project = "esp_modem"
+
+source_suffix = ['.rst', '.md']
+
+source_parsers = {'.md': 'recommonmark.parser.CommonMarkParser', }