Added a README and a test_picture

plot/README.md

+# PLOT
+This repo contains my day to day plotting scripts and is susceptible to vary
+from day to day.
+
+## qp
+
+My most useful script is `qp` (stands for *QuickPlot*) which
+uses `numpy` and `matplotlib`. It is a quick and dirty script that acts as a
+CLI script to plot data files. It started a long time ago and as time passes
+and I get more and more knowledge of matplotlib and python, things change.
+Some features might disappear and some are kind of fuzzy, experimental or not
+compatible at all.
+
+The core of the script is still that:
+```
+qp -i file.dat 1:2
+```
+will plot column 1 against column 2 of `file.dat`.
+
+## Old.mplstyle
+
+`Old.mplstyle` is a style file for matplotlib. It changes default parameters
+like linewidth for both axes and curves, markers, fonts etc. The style is made
+to give an "old school scientific paper" (hence the name) feel to the plots.
+The idea is essentially that the figures can be understood printed in
+grayscale (no "colors online" bullshit). Here is an example:
+
+![An image to show the style.](./Test_picture.png)