- move source file according with platformio standard directory structure

- remove lib_deps from platformio.ini since they are already in libs folder

src/CharBuffer.cpp

@@ -0,0 +1,13 @@
+#include "CharBuffer.h"
+
+void CharBuffer::initialize()
+{
+    _buffer = new char[CHAR_BUFFER_SIZE];
+}
+
+char *CharBuffer::get()
+{
+    return _buffer;
+}
+
+char* CharBuffer::_buffer;