I recently installed Fedora 20 and during the installations, I made a new disk partition where I installed Windows after Fedora. I do not get the alternative of booting Fedora now. How would I go about booting Fedora?
Use EasyBCD to dual-boot your OSs. It's simple and there are many documents for this...
Download it from: http://neosmart.net/EasyBCD/ or search the web...
You first installed Fedora in one partition, afterwards you installed Windows on another partition. This did not only install windows inside that partition, but also replaced the old boot loader by a windows boot loader, which does not give you the option to boot your Fedora anymore.
The next time you install such a system, first install Windows and then your Linux distribution. Linux distributions usually recognize Windows without problems and add a boot option for it.
For now you need some kind of Linux live CD to get a boot loader able to boot your system. How did you install your Fedora? You probably still have the installation media around. This should allow you to reinstall a good boot loader and repair your system that way.
Here is the official documentation for Fedora 14, I couldn't find the one for Fedora 20, but there are good chances it works the same way.