Merge pull request #260 from eveyonline/article-about-brainstorming

added a small description of one way how to animate brainstorming sessions

guides/agile/How_To_Brainstorm.md

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+# How to do a brainstorming
+
+Before starting a brainstorming session everybody should agree to theses rules:
+
+- Quantity then quality - tell all your thoughts and ideas - even the most foolish ones are welcome, no self censorship
+- Be scandalous, funny, wild, creative
+- Build your ideas on other people’s ideas
+- No judgment, no evaluation, no critics - discussion comes later
+- Show and read your post-its for everybody
+
+## How do we do the brainstorming ?
+
+- On remote : Meet/skype/TeamViewer/orwhatever + screenshare of your Trello Board / OrWhatEverYouUse
+- Onsite : Juste a wall and post-its
+- You create as many cards as you want to (you can propose silent brainstorming for some minutes)
+- Then each participant reads the post-it and explains his/her thoughts.
+
+## What 2 Do ?
+
+- Then you can create up to 6 categories where to put / organize the trello cards or post-its.
+- Dot-Voting : Everybody has three votes and then you choose the three favorit categories
+- Choose concret actions for each category, give a maintainer and a date