Added osmdata rooftop id to Population Estimates fixes #11

[AmyMikhail]

Per @pbkeating 's issue #11 request and discussion I have added code to the Population estimates case study that uses osmdata to import points for buildings in Kario camp and add them to the map.

[aspina7]

Hey @AmyMikhail thanks for doing this. Code osmdata code all looks good, but for the case study I would stick to using the shapefile given, and have the osmdata stuff in an appendix as an optional extra (particularly because if everyone runs this in a class the it'll way overshoot the api limit).
Also as a sidenote, is good practice when working with git to not go over the 80 characters per line (for both code and regular text) - this makes it much easier when reviewing in window. In rstudio you can add a line that shows you where those 80 characters end, to do this go tools > global options > code > display and tick show margin (put 80 in the box). Markdown text with a single return between lines will still show up as a single paragraph, so not an issue there.

Thanks!

[AmyMikhail]

Thanks Alex,

I will shift the extra bit to the appendix in that case - hadn't consider the API limit but you are right, if everyone tries to do it at the same time there will likely be issues. So the part I will shift is from line 315 until 427.

Regarding the 80 characters - I do already use that line for code, but had not been using it for markdown text as I thought it would somehow corrupt the automatic wordwrap when the document is rendered - useful to know that it won't. I noticed that if you switch between normal and preview mode, it automatically wraps the markdown text in this way - not sure if/ how this is preserved but if yes, would be a simple thing to do before pushing to git and not have to use manual line breaks for long tracts of text.