minor #145 rewrote the README file (fabpot)
minor #145 rewrote the README file (fabpot)

This PR was merged into the 2.1.x-dev branch.

Discussion
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rewrote the README file

closes #126

Commits
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c572305 rewrote the README file

arduanov/Pimple,gomboc/Pimple,jbboehr/Pimple,mnapoli/simplex,jpauli/Pimple,fabpot/Pimple,fabpot/Pimple,gomboc/Pimple,jpauli/Pimple,jpauli/Pimple,silexphp/Pimple,arduanov/Pimple,michabbb-backup/Pimple,RustJason/Pimple,RustJason/Pimple,jbboehr/Pimple