Add documentation

Author: miscco

docs/libcudacxx/standard_api/algorithms_library.rst

@@ -13,6 +13,9 @@ Algorithms Library
    * - `\<cuda/std/algorithm\> <https://en.cppreference.com/w/cpp/header/algorithm>`_
      - Fundamental library algorithms
      - CCCL 3.2.0 / CUDA 13.2
+   * - `\<cuda/std/execution\> <https://en.cppreference.com/w/cpp/header/execution>`_
+     - Standard parallel algorithms
+     - CCCL 3.4.0 / CUDA 13.4
 
 Extensions
 ----------
@@ -31,3 +34,57 @@ Restrictions
     * ``sort``
     * ``stable_partiin``
     * ``stable_sort``
+
+Parallel standard algorithms
+----------------------------
+
+CCCL provides an implementation for the standard `parallel algorithms library <http://www.eel.is/c++draft/algorithms.parallel>`_
+
+Currently the CUDA backend is the only supported backend. It can be selected by passing the `cuda::execution::gpu`
+execution policy to one of the supported algorithms. The CUDA backend requires the passed in sequences to reside in
+device accessible memory and the iterators into those sequences to be at least random access iterators. The CUDA backend
+is enabled if the program im compiled with a CUDA compile in CUDA mode.
+
+The use of any other execution policy is currently not supported and results in a compile time error.
+
+The following algorithms are supported:
+
+  * ``adjacent_difference``
+  * ``adjacent_find``
+  * ``all_of``
+  * ``any_of``
+  * ``copy``
+  * ``copy_if``
+  * ``copy_n``
+  * ``count``
+  * ``count_if``
+  * ``equal``
+  * ``exclusive_scan``
+  * ``fill``
+  * ``fill_n``
+  * ``find``
+  * ``find_if``
+  * ``find_if_not``
+  * ``for_each``
+  * ``for_each_n``
+  * ``generate``
+  * ``generate_n``
+  * ``inclusive_scan``
+  * ``merge``
+  * ``mismatch``
+  * ``none_of``
+  * ``reduce``
+  * ``remove``
+  * ``remove_copy``
+  * ``remove_copy_if``
+  * ``remove_if``
+  * ``replace``
+  * ``replace_copy``
+  * ``replace_copy_if``
+  * ``replace_if``
+  * ``reverse``
+  * ``reverse_copy``
+  * ``transform``
+  * ``transform_reduce``
+  * ``unique``
+  * ``unique_copy``