Base: Add a man page for the 'bt' command.

Author: https://github.com/bgianfo
Commit: https://github.com/SerenityOS/serenity/commit/38fe67abb4a
Pull-request: https://github.com/SerenityOS/serenity/pull/6771
Reviewed-by: https://github.com/linusg

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

@@ -0,0 +1,44 @@
+## Name
+
+bt - view the backtrace of the specified process
+
+## Synopsis
+
+```**sh
+$ bt <pid>
+```
+
+## Description
+
+This program is used to inspect the current executable state of a process.
+It will read the stack of each thread in the process, and symbolize the
+addresses for each frame in the stack producing a backtrace.
+
+**NOTE**:
+
+* Kernel addresses will not be available unless you are super user.
+
+* If Kernel addresses are available, they will not be symbolized unless the
+  `SymbolServer` service has access to the `/boot/Kernel` file.
+
+## Examples
+
+View all stacks of pid number 10:
+
+```sh
+$ bt 10
+```
+
+Use [`watch`(1)](watch.md) to emit a backtrace of pid 124, every second:
+
+```sh
+$ watch -n 1 -- bt 124
+```
+
+## See also
+
+* [`Inspector`(1)](Inspector.md)
+
+* [`Profiler`(1)](Profiler.md)
+
+* [`watch`(1)](watch.md)