[enh] Add an adminsys charter

adminsys_charter.md

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+# YunoHost System Administrator Charter
+
+Because great powers imply great responsibilities, I commit myself as YunoHost adminsys to respect these points:
+
+## Security
+The reliability and security of our services is the responsibility of all, below are some rules to follow to avoid becoming an attack vector of the YunoHost infra :
+
+ * do not save project password in a non-free browser or without master password;
+ * do not use ssh keys without passwords to access the infrastructure (except for exceptions discussed collectively);
+ * get into the habit of locking your machines where the keys are located when you leave them;
+ * do not let people without access, plant third party devices in your machine(s);
+ * encrypt the machines used to access the infra ;
+
+
+## Ethics / practice
+
+ * do not give yourself access by escalation of privileges and ensure that the YunoHost infrastructure administration team remains in possession of its accesses;
+ * verify the effectiveness of backups and rescue means before performing risky maintenance;
+ * respects privacy of our users and limit to the maximum the display of private information during debugging ;
+ * in case of legal requests, do not act without consulting other contributors ;
+
+
+
+## Resilience, sharing and transparency
+In order to ensure the resilience of the deployed infrastructure, everyone agrees to do their best to:
+
+ * report to other adminsys the operations performed on the infrastructure
+ * produce documentation on their infrastructure and services;
+ * create an announcement on the forum to announce any maintenance or breakdown.