Add initial support for rocJPEG documentation (#9)

[ROCm/rocjpeg commit: 3c803847f7]

projects/rocjpeg/docs/reference/index.md

@@ -0,0 +1,14 @@
+<head>
+  <meta charset="UTF-8">
+  <meta name="description" content="rocJPEG API reference">
+  <meta name="keywords" content="API reference, rocJPEG, AMD, ROCm">
+</head>
+
+# API reference
+
+This section provides technical descriptions and important information about the different rocJPEG
+APIs and library components.
+
+* {doc}`Library <../doxygen/html/files>`
+* {doc}`Functions <../doxygen/html/globals>`
+* {doc}`Data structures <../doxygen/html/annotated>`