Add hardware requirements. GitHub issue #247.

Signed-off-by: Roberto Rosario <roberto.rosario.gonzalez@gmail.com>

docs/topics/installation.rst

@@ -5,6 +5,15 @@ The easiest way to use Mayan EDMS is by using the official Docker_ image.
 Make sure Docker is properly installed and working before attempting to install
 Mayan EDMS.
 
+Hardware requirements
+---------------------
+
+- 2 Gigabytes of RAM (1 Gigabyte if OCR is turned off).
+- Multiple core CPU (64 bit, faster than 1 GHz recommended).
+
+Docker procedure
+----------------
+
 With Docker properly installed, proceed to download the Mayan EDMS image using
 the command:
 
@@ -31,4 +40,7 @@ For the complete set of installation, configuration, upgrade, and backup
 instructions visit the Mayan EDMS Docker Hub page at:
 https://hub.docker.com/r/mayanedms/mayanedms/
 
+
+
+
 .. _Docker: https://www.docker.com/