Initial ROCm-docs (#92)

* Initial ROCm-docs commit

Co-authored-by: Aurélien Bouteiller <bouteill@icl.utk.edu>
Co-authored-by: Alex Xu <alex.xu@amd.com>
Co-authored-by: yugang-amd <yugang.wang@amd.com>

docs/api/memory_management.rst

@@ -0,0 +1,35 @@
+.. meta::
+  :description: rocSHMEM intra-kernel networking runtime for AMD dGPUs on the ROCm platform.
+  :keywords: rocSHMEM, API, ROCm, documentation, HIP, Networking, Communication
+
+.. _rocshmem-api-memory-management:
+
+
+---------------------------
+Memory Management Routines
+---------------------------
+
+ROCSHMEM_MALLOC
+---------------
+
+.. cpp:function:: __host__ void *rocshmem_malloc(size_t size)
+
+  :param size: Memory allocation size in bytes
+  :returns: A pointer to the allocated memory on the symmetric heap;
+            If a valid allocation cannot be made, it returns NULL
+
+**Description:**
+Allocate memory of ``size`` bytes from the symmetric heap.
+This is a collective operation and must be called by all PEs.
+
+ROCSHMEM_FREE
+-------------
+
+.. cpp:function:: __host__ void rocshmem_free(void *ptr)
+
+  :param ptr: Pointer to previously allocated memory on the symmetric heap
+  :returns: None
+
+**Description:**
+Free a memory allocation from the symmetric heap.
+This is a collective operation and must be called by all PEs.