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Introduction
gantt.chart function
Step 1: making tasks list
ymd function of Lubridate package
step 2: labels of tasks
step 3: start date
step 4: End date
step 5: vertical grid position
step 6: vertical gird labels
step 7: gantt.chart function
step 8: adding vertical grid and vertical grid labels
step9 : priority legend and horizontal grid specification
title to the gantt.chart
Adding tasks to the task list
customizing Gannt chart further