Added a cmakelists to memmang to facilitate a cmake build

portable/MemMang/CMakeLists.txt

diff --git a/portable/MemMang/CMakeLists.txt b/portable/MemMang/CMakeLists.txt
new file mode 100644
index 0000000..b384a6e
--- /dev/null
+++ b/portable/MemMang/CMakeLists.txt
@@ -0,0 +1,21 @@
+cmake_minimum_required(VERSION 3.12)
+
+if(heap1_enabled)
+    message("Enabling Heap1")
+    add_library(FreeRTOS_MemMang heap_1.c)
+elseif(heap2_enabled)
+    message("Enabling Heap2")
+    add_library(FreeRTOS_MemMang heap_2.c)
+elseif(heap3_enabled)
+    message("Enabling Heap3")
+    add_library(FreeRTOS_MemMang heap_3.c)
+elseif(heap4_enabled)
+    message("Enabling Heap4")
+    add_library(FreeRTOS_MemMang heap_4.c)
+elseif(heap5_enabled)
+    message("Enabling Heap5")
+    add_library(FreeRTOS_MemMang heap_5.c)
+else()
+    message("No Heap Enabled")
+endif()
+