Base: Write some initial man pages

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

Base/usr/share/man/man2/access.md

@@ -0,0 +1,24 @@
+## Name
+
+access - check if a file is accessible
+
+## Synopsis
+
+```**c++
+#include <unistd.h>
+
+int access(const char* path, int mode);
+```
+
+## Description
+
+Check if a file at the given *path* exists and is accessible to the current user for the given *mode*.
+Valid flags for *mode* are:
+* `F_OK` to check if the file is accessible at all,
+* `R_OK` to check if the file can be read,
+* `W_OK` to check if the file can be written to,
+* `X_OK` to check if the file can be executed as a program.
+
+## Return value
+
+If the file is indeed accessible for the specified *mode*, `access()` returns 0. Otherwise, it returns -1 and sets `errno` to describe the error.