Docs: Add uname(1) and uname(2) man pages

Base/usr/share/man/man1/uname.md

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+## Name
+
+uname - print kernel information
+
+## Synopsis
+
+`uname [-s] [-n] [-r] [-m] [-a]`
+
+## Description
+
+Print information about the operating system, as reported by the `uname()`
+system call.
+
+## Options
+
+* `-s`: Print the system name
+* `-n`: Print the node name (hostname)
+* `-r`: Print the system release version
+* `-m`: Print the machine type
+* `-a`: Print all of the above
+
+## Examples
+
+```sh
+$ uname -sm
+Serenity i686
+```
+
+## See also
+
+* [`uname`(2)](../man2/uname.md)