Uploaded lesson on reading and writing .csv, including exploration of arguments in the functions
Updates to lesson and associated files
adding md file
Change file extension from rmd -> Rmd.
Set eval=FALSE for code chunk with hypothetical setwd statement.

Also change some of the output in md file because of system differences,
e.g. the number of decimal places to display.
Embed spreadsheet images.
Remove .Rhistory file.
Add link to supplemental lesson on read.csv from first R lesson.
Merge pull request #1 from jdblischak/csv_updates

Some edits to lesson on read.csv
Removed in-line tables given that JB successfully embedded images
updated lesson based on feedback from JB
Updated as per feedback from JB
Merge pull request #806 from natalie-robinson/creating-lesson-on-csvReadWrite

Create supplementary novice R lesson on reading and writing csv files.