Link AlgorithmDescription.md in AV1 document page

Added the code to link AlgorithmDescription.md file in AV1 doxygen
document page. Uncomment the change once AlgorithmDescription.md
file is done.

BUG=aomedia:2674

Change-Id: Ieae2c2020d397a2715b42e722bb14eb566db2df0

doc/AlgorithmDescription.md

diff --git a/doc/AlgorithmDescription.md b/doc/AlgorithmDescription.md
index 3d2bde3..4fe9961 100644
--- a/doc/AlgorithmDescription.md
+++ b/doc/AlgorithmDescription.md
@@ -1,3 +1,5 @@
+AlgorithmDescription.md                {#LALGORITHMDESCRIPTION}
+=======================
 <div style="font-size:3em; text-align:center;"> Algorithm Description </div>
 
 # Abstract

doc/dev_guide/av1_decoder.dox

diff --git a/doc/dev_guide/av1_decoder.dox b/doc/dev_guide/av1_decoder.dox
index 71fb4f2..f65ddb5 100644
--- a/doc/dev_guide/av1_decoder.dox
+++ b/doc/dev_guide/av1_decoder.dox
@@ -2,4 +2,10 @@
 
   Describe AV1 decoding techniques here.
 
+  \cond
+  \if av1_md_support
+  [AV1 Algorithm Description](\ref LALGORITHMDESCRIPTION)
+  \endif
+  \endcond
+
 */

docs.cmake

diff --git a/docs.cmake b/docs.cmake
index 8ead019..452bd4b 100644
--- a/docs.cmake
+++ b/docs.cmake
@@ -263,6 +263,9 @@
   if(${DOXYGEN_VERSION_VALUE} GREATER_EQUAL 1008016)
     set(AOM_DOXYGEN_SECTIONS ${AOM_DOXYGEN_SECTIONS} "av1_md_support")
     set(AOM_DOXYGEN_SOURCES ${AOM_DOXYGEN_SOURCES} "${AOM_ROOT}/README.md")
+    # Uncomment and add AlgorithmDescription.md in result page when it is done.
+    # set(AOM_DOXYGEN_SOURCES ${AOM_DOXYGEN_SOURCES}
+    # "${AOM_ROOT}/doc/AlgorithmDescription.md")
   endif()
 
   # Generate libaom's doxyfile.