componeent structure, preparation for component branch

components/rtc/CMakeLists.txt

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+idf_component_register(
+    SRCS 
+    INCLUDE_DIRS "."
+)

components/rtc/rtc.h

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+// Copyright 2020 Lukas Haubaum
+//
+// Licensed under the GNU Affero General Public License, Version 3;
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+
+//     https://www.gnu.org/licenses/agpl-3.0.html
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+/**
+ * @file
+ * 
+ * @brief interface for RTC
+ * 
+ */
+#ifndef _rtc_H_
+#define _rtc_H_
+
+#include <time.h>
+
+/**
+ * @brief Read time 
+ */
+void rtc_get_time(struct tm *time);
+
+/**
+ * @brief Write time
+ */
+void rtc_set_time(struct tm *time);
+
+#endif