Add compatible_hardware.md

Author: Kloadut

compatible_hardware.md

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+# Compatible hardware
+
+Every machine kind below are compatible with YunoHost. Consequently, this list is not comprehensive.
+* **x86** : Every personal computer with x86 CPU architecture: Desktop PC, laptop PC, Intel Macintosh, netbooks, nettops, etc.
+***[Install via CD/USB](/install) or [on existing Debian](/install_on_debian)***
+
+* **armhf** : Raspberry Pi, Cubox, [Cubieboard](/install_on_cubieboard), etc. ***[Installation on Debian](/install_on_debian) only***
+
+* **powerpc** : Mostly Macinstosh G4/G5 ***[Installation on Debian](/install_on_debian) only***
+
+**Recommended hardware** : Recent x86 computer, silent and low consumption.
+
+---
+
+### Minimum requirement
+
+* 256MB RAM
+
+* 4GB storage
+
+### Recommended
+
+* 512MB RAM in order to run all the services and apps properly
+
+* 20GB storage in order to store more mails and documents