add required pio library

.gitignore

@@ -0,0 +1,5 @@
+.pio
+.vscode/.browse.c_cpp.db*
+.vscode/c_cpp_properties.json
+.vscode/launch.json
+.vscode/ipch

.vscode/extensions.json

@@ -0,0 +1,7 @@
+{
+    // See http://go.microsoft.com/fwlink/?LinkId=827846
+    // for the documentation about the extensions.json format
+    "recommendations": [
+        "platformio.platformio-ide"
+    ]
+}

platformio.ini

@@ -12,3 +12,4 @@
 platform = atmelavr
 board = sparkfun_promicro8
 framework = arduino
+lib_deps = makuna/RTC@^2.3.5

src/main.cpp

@@ -13,9 +13,9 @@
 
 SoftwareWire myWire(SDA, SCL);
 RtcDS1307<SoftwareWire> Rtc(myWire);
-/* for software wire use above */
+for software wire use above
 
-/* for normal hardware wire use below */
+for normal hardware wire use below */
 #include <Wire.h> // must be included here so that Arduino library object file references work
 #include <RtcDS3231.h>
 #include <EepromAT24C32.h>