Php update: connexion separated from closure  ; index.php continued.

* php/connexion.php: removed connexion closure, which is displaced to (new) php/close.php

* php/close.php (new): closes the mysql. meant to be placed at the end of php/index.php

* php/index.php: added include of the php/close.php at the end of the file ; added <tbody> around
  the requêtes include ; added link to a future stylesheet in css/.
Added .gitignore

* .gitignore (new): meant to keep git away from tracking a personnal php/connexion2.php
  that may be of use for tests on one's personnal computer.
Project pdf, css blank file, sql fixes.

* projet_pokemon.pdf (new): guideline of the project given by the teacher.

* css/main.css (new): main stylesheet (blank as of now).

* sql/tp_pok.sql: fixes to the sql insertion in the tables. still not working.