Created Installation (markdown)

Installation.md

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+### Windows
+
+* Download the latest `windows.zip`
+* Right click > Properties > Unblock
+* Extract the zip
+* Run Ombi.exe
+
+
+### Linux systems
+
+* Download the latest `linux.zip`
+* Extract to a directory e.g. `/opt/Ombi`
+* Set working directory as `/opt/Ombi`
+* Make the Ombi file an executable: `chmod +x Ombi`
+* Run Ombi `.\Ombi`  
+
+Note: If you get the following:
+> libunwind.so.8: cannot open shared object file You may need to install libwind8.   
+
+Run `apt-get install libunwind8`
+
+Seeing this error?    
+> System.TypeInitializationException: The type initializer for 'System.Net.Http.CurlHandler' threw an exception.
+
+Run `apt-get install libcurl4-openssl-dev`
+
+### MacOS
+
+* Download the latest `osx.zip`
+* Extract to a directory
+* Set working directory to where you extracted
+* Run Ombi `.\Ombi`  
+
+**Default port is 5000**