Base: Add rm(1) manpage

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

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+## Name
+
+rm - Remove files
+
+## Synopsis
+
+```**sh
+$ rm [options...] <path...>
+```
+
+## Description
+
+`rm` removes files specified in `path`.
+
+If a directory is specified in `path`, the `-r` (recursive) flag is required. Otherwise, an error occurs.
+
+## Options
+
+* `-r`, `--recursive`: Remove files and directories recursively
+* `-f`, `--force`: Do not prompt before removing
+* `-v`, `--verbose`: Display what files are removed
+
+## Examples
+
+```sh
+# Remove README.md file
+$ rm README.md
+
+# Remove cpp-tests directory
+$ rm -r cpp-tests
+```