Base: Add man pages for create_shared_buffer() and share_buffer_with()

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

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+## Name
+
+create\_shared\_buffer - create a shareable memory buffer
+
+## Synopsis
+```**c++
+#include <SharedBuffer.h>
+
+int create_shared_buffer(int size, void** buffer);
+```
+
+## Description
+
+Creates a new memory region that can be shared with other processes. The region is only accessible to the creating process by default.
+
+## Return value
+
+If a region is successfully created, `create_shared_buffer()` stores a pointer to the memory in `buffer` and returns a buffer ID. Otherwise, it returns -1 and sets `errno` to describe the error.
+
+## Errors
+
+* `EINVAL`: `size` is zero or negative.
+* `EFAULT`: `buffer` is not a valid address.