add dev-environement ADR

docs/ADR/001-Development-environment.md

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+# 001  Development environment.md
+
+## Status
+
+Accepted
+
+## Context
+
+we need to create a virtual cluster to do test without impact on production 
+diferent way:
+
+### Virtualisation or Container
+
+Virtualisation provide better isolation but must ressource are needed.  
+Container able to create more item without consum as resource than virtual machine.
+
+
+### Creation Wrapper
+
+Vagrant is good top manage virtual machine but not a lot of LXC box availlable, Vagant van be use with other configuration manager than ansible.
+Molecule can manage molecule with plugins molecule-LXD. molecule is ansible exclusive solution
+
+## Decision
+
+we will use container instead VM for the resource consumption avantage.
+
+Molecule wrapper will be use  because all our configuration is already provide by ansible and we can have a better choise of container with molecule than vagrant.
+
+## Consequences
+
+Need to create dev env other an LXD server.
+