Create devtools.md

doc/devtools.md

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+# Devtools
+
+# Check third party licences
+
+Install `yolk3k` pip package:
+
+    pip install yolk3k
+
+Then execute command:
+
+    yolk -l -f license
+
+Output will look like:
+
+```
+Babel (2.2.0)
+    License: BSD
+
+Beaker (1.6.4)
+    License: BSD
+
+CherryPy (3.6.0)
+    License: BSD
+
+FormEncode (1.3.0a1)
+    License: PSF
+
+Genshi (0.7)
+    License: BSD
+...
+```