Added top command for Linux and OSX

pages/osx/top.md

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+# top
+
+> Display dynamic real-time information about running processes.
+
+- Start top, all options are available in the interface
+
+`top`
+
+- Start top sorting processes by internal memory size (default order - process ID)
+
+`top -o mem`
+
+- Start top sorting processes first by CPU, then by running time
+
+`top -o cpu -O time`
+
+- Start top displaying only processes owned by given user
+
+`top -user {{user-name}}`
+
+- Run top in logging (batch) mode and update information 5 times
+
+`top -l 5`
+
+- Get help about interactive commands
+
+`?`