Add Serbian translation, and a translation guide

translations.qrc

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+<RCC/>

translations/README.md

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+## So, I hear ya want to translate
+here is how to do it:
+Firstly, run `lupdate ../KShare.pro -no-obsolete -ts <your locale (eg. en_US or sr_RS)>.ts`
+
+If you see something that looks like it was just changed a bit, take the old translation and update it, as `-no-obsolete` removed it.
+Then open and edit the file in Qt Linguist.
+When you're done editing the file, save it and run `lrelease <your .ts file>` and add an entry into `../translations.qrc` for the newly produced `.qm` file (if there isn't one).
+
+That's all, thank you!