Add Convert An ePub Document To PDF On Mac as a workflow til

Also add the new workflow section

README.md

@@ -10,7 +10,7 @@ smart people at [Hashrocket](http://hashrocket.com/).
 For a steady stream of TILs from a variety of rocketeers, checkout
 [til.hashrocket.com](https://til.hashrocket.com/).
 
-_589 TILs and counting..._
+_590 TILs and counting..._
 
 ---
 
@@ -38,6 +38,7 @@ _589 TILs and counting..._
 * [Unix](#unix)
 * [Vim](#vim)
 * [Webpack](#webpack)
+* [Workflow](#workflow)
 
 ---
 
@@ -696,6 +697,10 @@ _589 TILs and counting..._
 - [Specify Port Of CRA's Webpack Dev Server](webpack/specify-port-of-cra-webpack-dev-server.md)
 - [Use A Specific Config File](webpack/use-a-specific-config-file.md)
 
+## Workflow
+
+- [Convert An ePub Document To PDF On Mac](workflow/convert-an-epub-document-to-pdf-on-mac.md)
+
 ## Usage
 
 The `.vimrc` file for this project contains a function `CountTILs` that can

workflow/convert-an-epub-document-to-pdf-on-mac.md

@@ -0,0 +1,21 @@
+# Convert An ePub Document To PDF On Mac
+
+If you have an ePub document and you'd like it in PDF format, you can
+convert it using the `ebook-convert` binary from `Calibre`.
+
+First, install `Calibre`:
+
+```bash
+$ brew cask install calibre
+```
+
+Then convert your ePub using `ebook-convert`:
+
+```bash
+$ ebook-convert book.epub book.pdf
+```
+
+You'll see a bunch of output as it processes the document. When it
+completes, you'll have a nice pdf waiting for you.
+
+[source](https://gist.github.com/AaronO/9962667)