Wrap readme at 100 lines and add documentation about auto-downloads

README.md

@@ -6,7 +6,7 @@ This is a presentation about Git.
 
 To build it, you will need make, pdflatex and ansi-to-svg and inkscape.
 
-To build the main pd, run:
+To build the main pdf, run:
 
 ```bash
 make main.pdf
@@ -26,7 +26,9 @@ make only-notes.pdf
 
 ## Auto Images
 
-The build system will generate certain types of graphics for the presentation as part of the build system. The resultant files will always go in the `auto-images` folder. As a result, this folder is not under version control.
+The build system will generate certain types of graphics for the presentation as part of the build
+system. The resultant files will always go in the `auto-images` folder. As a result, this folder is
+not under version control.
 
 In latex, all you need to do is
 
@@ -44,13 +46,16 @@ What is a presentation without an xkcd comic?
 \includegraphics[<options>]{auto-xkcd-<id>.png}
 ```
 
-If the above is included in the latex document, the XKCD comic with the specified ID will be downloaded and embedded in the pdf.
+If the above is included in the latex document, the XKCD comic with the specified ID will be
+downloaded and embedded in the pdf.
 
 ### Shell Output
 
-I am still not aware of aware of a reliable way to include ansi coloured shell output into a latex document. I also don't want to include loads of high-res screenshots in my Git repo.
+I am still not aware of aware of a reliable way to include ansi coloured shell output into a latex
+document. I also don't want to include loads of high-res screenshots in my Git repo.
 
-The work around I have come up with is to save the raw ansi output to a wile in `shell-output`. This normally involves forcing an application to output in colour:
+The work around I have come up with is to save the raw ansi output to a wile in `shell-output`. This
+normally involves forcing an application to output in colour:
 
 ```bash
 git -c color.status=always status > shell-output/git-status.out
@@ -63,3 +68,14 @@ git -c color.status=always status > shell-output/git-status.out
 ```
 
 The build system will convert the ansi output into an embeddable PDF that LaTeX will embed.
+
+### Online images
+
+In order to download an image from the internet and embed it in the presentation, you need do
+provide the extension and the base64 encoded URL.
+
+```latex
+\includegraphics[<options>]{auto-download-<base64 encodede url>.png}
+```
+
+