README added.

README.md

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+# PbDbFixer
+
+## Motivation
+Since Pocketbook has some problems with extracting metadata correctly from
+EPUB files, this program tries fix these issues. It tries to identify
+wrong database entries and fix it by reading the corresponding epub
+metadata.
+
+## Compatibility
+This program is tested only on a PocketBook Touch HD 3 device (software
+version 6.1.900). It might work with other PocketBook devices/software
+versions. Please tell me, if it works for you (do make a backup of these
+explorer-3.db before trying!).
+
+## Installation and Usage
+Just copy the executable file into the PocketBook's application directory.
+If you encounter duplicate authors in the PocketBook's library, open the
+applications screen and tap on the PbDbFixer icon.
+
+## Build
+To be able to build PbDbFixer, you have to have the cross compiler for
+ARM CPUs installed. On Arch Linux, the AUR package `arm-linux-gnueabi-gcc75-linaro-bin`
+does the job. Don't forget tell `cargo` which compiler/linker it has to
+invoke. In my case, I hat to edit `~/.cargo/config`:
+```
+[target.arm-unknown-linux-gnueabi]
+linker = "arm-linux-gnueabi-gcc"
+```
+Now you can easily compile the stuff by invoking
+```
+cargo build --release --target=arm-unknown-linux-gnueabi
+```