Updated readme

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+Introduction_to_GIS_in_R.Rmd
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README.md

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-# Introduction_to_GIS_in_R
+# Introduction to GIS in R
+
+**Prerequisites:**
+* Intermediate knowledge of R and `tidyverse`
+* LINK TO INTRO COURSE
+
+**By the end of the course you will:**
+
+* Know got to load spatial data into R using the sf library.
+* Be familiar with using GSS codes to join statistics to geographies.
+* Understand how spatial objects can be manipulated using tidyverse.
+* Understand how to use spatial joins.
+* Be aware of map projections and Coordinate Reference Systems (CRS) and be able to modify them.
+* Know how to make static and interactive maps in tmap.
+* Be able to export your maps and shapefiles.