Created Calibre plugin (markdown)

Calibre-plugin.md

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+In the beginning there was the project to make KCC work *also* as a Calibre plugin.
+Calibre is great for a comic collection management.
+The idea is still there (so no, it isn't a _not going to happen ever_) but the current difficulties are:
+* **I'm porting KCC to Python 3 and Qt5, and Calibre is Python 2** this could lead to version issues or require a greater effort in writing 2/3 code (it is actually possibile, though)
+* **writing a Calibre plugin isn't a breeze** we prefer to fix and improve the standalone KCC before creating the plugin
+* **the Calibre plugin will not be a KCC replacement at all** it would probably give all _comic2ebook_ and _image_ features at their most common options
+* **kindlegen issue is stille there** and until we can figure out how to fix that, Calibre MOBI generator is not an option.