Added simple docs sketch

esp_modem/docs/cpp_api.h

@@ -0,0 +1,60 @@
+//  --- DCE command documentation starts here ---
+
+class DCE: public DCE_T<GenericModule> {
+public:
+    using DCE_T<GenericModule>::DCE_T;
+
+
+
+
+
+
+/**
+ * @brief Sends the supplied PIN code
+ *
+ * @param pin Pin
+ *
+ */ command_result set_pin (const std::string& pin); /**
+ * @brief Checks if the SIM needs a PIN
+ *
+ * @param[out] pin_ok Pin
+ */ command_result read_pin (bool& pin_ok); /**
+ * @brief Reads the module name
+ *
+ * @param[out] name module name
+ */ command_result set_echo (const bool x); /**
+ * @brief Reads the module name
+ *
+ * @param[out] name module name
+ */ command_result resume_data_mode (); /**
+ * @brief Reads the module name
+ *
+ * @param[out] name module name
+ */ command_result set_pdp_context (PdpContext& x); /**
+ * @brief Reads the module name
+ *
+ * @param[out] name module name
+ */ command_result set_command_mode (); /**
+ * @brief Reads the module name
+ *
+ * @param[out] name module name
+ */ command_result set_cmux (); /**
+ * @brief Reads the module name
+ *
+ * @param[out] name module name
+ */ command_result get_imsi (std::string& x); /**
+ * @brief Reads the module name
+ *
+ * @param[out] name module name
+ */ command_result get_imei (std::string& x); /**
+ * @brief Reads the module name
+ *
+ * @param[out] name module name
+ */ command_result get_module_name (std::string& name); /**
+ * @brief Sets the modem to data mode
+ *
+ */ command_result set_data_mode (); /**
+ * @brief Get Signal quality
+ *
+ */ command_result get_signal_quality (int& x, int& y);
+};