more file documentation

threadr/board/README.md

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+# A short overview of the files:
+### index.php
+Somewhat obvious...
+$_GET values:
+  * id → the board id
+  * action → what action file should be loaded in the bottom section (see below)
+    * valid actions: [not present], post, submit, edit
+### board.php
+the top part of a board page, displays the posts, loaded via include()
+### post.php
+one of the action files for the bottom of the page, displays a form to add a post, loaded via include()
+### submit.php
+displays a message in the bottom of the page and submits a new post, loaded via include()
+### edit.php
+? [Will look into it later, seems not to do very much ATM]
+### default.php
+displays a button giving the user the option to post something
+### README.md
+this file