[Cin] Manual Appendix: Keyframes and Plugins

I have added a new section to the "Real-World" appendix. It is about a workflow on "Keyframes and Plugins" and is written by DeJay as a post in our forum. See if it is okay. @Dejay I've made minor changes, see if they work for you. If you have other changes or additions let me know. In addition to the .tex files I also attach the .txt file for everyone to read and review.