Add HTML embedded tables

TS-0019-Abstract_Test_Suite_&_implementation_eXtra_Information_for_Test.md

@@ -326,14 +326,38 @@ Both primitives contain another parameters that permits to dynamically configure
 
 **Table 5.4.1-1: Mapping of TTCN-3 Primitives to oneM2M Service Primitives**<a name="table_5.4.1-1"></a>
 
-|TTCN-3 Primitive |oneM2M Message |Direction |IUT |
-|-|-|-|-|
-|M2MRequestPrimitive |Request Primitive |<=> |AE |
-|M2MRequestPrimitive |Request Primitive |<=> |CSE |
-|M2MResponsePrimitive |Response Primitive |<=> |AE |
-|M2MResponsePrimitive |Response Primitive |<=> |CSE |
-
-
+<table>
+    <thead>
+        <tr>
+            <th>TTCN-3 Primitive</th>
+            <th>oneM2M Message</th>
+            <th>Direction</th>
+            <th>IUT</th>
+        </tr>
+    </thead>
+    <tbody>
+        <tr>
+            <td rowspan=2>M2MRequestPrimitive</td>
+            <td rowspan=2>Request Primitive</td>
+            <td><=></td>
+            <td>AE</td>
+        </tr>
+        <tr>
+            <td><=></td>
+            <td>CSE</td>
+        </tr>
+        <tr>
+            <td rowspan=2>M2MResponsePrimitive</td>
+            <td rowspan=2>Response Primitive</td>
+            <td><=></td>
+            <td>AE</td>
+        </tr>
+        <tr>
+            <td><=></td>
+            <td>CSE</td>
+        </tr>
+    </tbody>
+</table>