[PATCH] doc/common-patterns.txt: initial version

[Denis Kenzior]

Hi Giacinto,

---
doc/common-patterns.txt | 165 ++++++++++++++++++++++++++++++++++++++++
1 file changed, 165 insertions(+)
create mode 100644 doc/common-patterns.txt

Applied with some minor edits. I also changed the use of tabs into
spaces in a few areas to help things line up better.

Regards,
-Denis