added README for scripts

scripts/README.md

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+# My typesetting environment
+
+<pre>
+./tlmgr-update          Updates TeX Live
+./pdfoptmod             Executes pdfopt and removes the original pdf file
+./LaTeX-git-wdiff       Converts the output of git diff --color-words
+./LaTeX-git-log         Converts the output of git log into LaTeX
+./LaTeX-git-log-author  Converts the output of git log into LaTeX
+./makeindex-dtx         Executes makeindex for dtx files
+</pre>