Changes for C++ support, Add gitigore

- extern C around libraries and main function
- Include common libraries
- Create gitignore

.gitignore

@@ -0,0 +1,7 @@
+# ESP-IDF default build directory
+build
+sdkconfig
+
+# VIM files
+*.swp
+*.swo

main/CMakeLists.txt

@@ -1,2 +1,2 @@
-idf_component_register(SRCS "armchair.c"
+idf_component_register(SRCS "main.cpp"
                     INCLUDE_DIRS ".")

main/armchair.c

@@ -1,6 +0,0 @@
-#include <stdio.h>
-
-void app_main(void)
-{
-
-}

main/main.cpp

@@ -0,0 +1,18 @@
+extern "C"
+{
+#include <stdio.h>
+#include <esp_system.h>
+#include <esp_event.h>
+#include <nvs_flash.h>
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+#include "driver/gpio.h"
+#include "esp_log.h"
+#include "sdkconfig.h"
+}
+
+extern "C" void app_main(void)
+{
+
+
+}