added a few more documentation files

threadr/about/README.md

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+# Short documentation of all files
+### index.php
+Self-Explanatory

threadr/img/README.md

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+# Short documentation of all files
+### index.html
+This is my usual nope.html to prevent kiddies from poking at my files. It just redirects. There is no real security benefit to it though as it does not even prevent `wget -r`.
+### *.{svg,png,jpg}
+images that are used on the page

threadr/logout/README.md

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+# Short documentation of all files
+### index.php
+Self-Explanatory

threadr/userhome/README.md

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+# Short documentation of all files
+### index.php
+Self-Explanatory