Add installation step-by-step

[BioGeek]

Make installation a bit easier for newbies.

The lines

$ sudo apt-get install libpcre3-dev
$ sudo apt-get install zlibc

quickly tell how to install the required dependencies.

The line

$ cp -puv src/fastq-{grep,kmers,match,uniq,qual,sample,qualadj,sort,qscale} /usr/local/bin/

copies the executables.

And finally we clean up.

$ cd ..
$ rm fastq-tools -rf