Update README.md

Author: 20162026

README.md

@@ -95,6 +95,23 @@ Note this is not part of the standard Library and should not be relied on once
 Example Usage:
 `static_assert(beman::has_constexpr_support<beman::inplace_vector<int, 5>>)`.
 
+### Freestanding
+
+`beman::freestanding::inplace_vector` implements a minimal freestanding version of the specification,
+which marks all potentially throwing functions as `= deleted`.
+This is useful for platforms without exception support, as it will generate a compile-time error
+instead of a potential runtime error when trying to use a throwing function.
+
+``` C++
+beman::inplace_vector<int, 1> iv;
+iv.resize(0); // OK
+iv.resize(10); // will throw or abort
+
+beman::freestanding::inplace_vector<int, 1> fs_iv;
+fs_iv.resize(0); // will generate a compile-time error
+fs_iv.resize(10); // will generate a compile-time error
+```
+
 ## How to Build
 
 ### Compiler support