wip : initial WASM port

Works but it is very slow because no SIMD is used.
For example, jfk.wav is processed in ~23 seconds using "tiny.en" model

examples/CMakeLists.txt

@@ -0,0 +1,14 @@
+# dependencies
+
+find_package(Threads REQUIRED)
+
+# third-party
+
+#add_subdirectory(third-party)
+
+# examples
+
+if (EMSCRIPTEN)
+    add_subdirectory(whisper.wasm)
+else()
+endif()