Base: Write some initial man pages

It ain't much, but it's honest work!

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

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+## Name
+
+crash - intentionally perform an illegal operation
+
+## Synopsis
+
+```**sh
+$ crash [options]
+```
+
+## Description
+
+This program is used to test how the Serenity kernel handles
+userspace crashes, and can be used to simulate many different
+kinds of crashes.
+
+## Options
+
+* `-s`: Perform a segmentation violation by dereferencing an invalid pointer.
+* `-d`: Perform a division by zero.
+* `-i`: Execute an illegal CPU instruction.
+* `-a`: Call `abort()`.
+* `-m`: Read a pointer from uninitialized memory, then read from it.
+* `-f`: Read a pointer from memory freed using `free()`, then read from it.
+* `-M`: Read a pointer from uninitialized memory, then write to it.
+* `-F`: Read a pointer from memory freed using `free()`, then write to it.
+* `-r`: Write to read-only memory.
+
+## Examples
+
+```sh
+$ crash -F
+Shell: crash(33) exitied due to signal "Segmentation violation"
+```