[Linux dev][memory] Updated the reference link
[Linux dev][memory] Added refrence related to memroy
[Linux dev][i2c] Added reference for i2c
[Linux dev] Added refrence of TODO list
[web] Added refrence web
[C language] Added reference link
[Shell] Added reference and todo list
[Linux env] Added todo list
[Linux dev] Android vold reference link
[C language] Calculated the day of week by Y/M/D