Add Manhattan Plot to Statistical Analysis

[XinsongDu]

Add Manhattan Plot (example plot can be found in this paper: https://www.sciencedirect.com/science/article/abs/pii/S0022347616000287?via%3Dihub) to the pipeline. Sample data can be used to test your code. Steps:

• Google the term and learn about what Manhattan plot is.
• Write code to create Manhattan plot for Sample data.
• Analyze input and output of your code, add argument parser for Python or argument parser for R.
• Check code qualify using pylint (if using Python) or lintr (if using R) and improve code quality based on checking results.
• Modify main.nf to integrate your new code to RUMP and test your code.
• Make a pull request and wait for review.

Figure 4B of this paper might be a good reference.