add README.md

Author: ypresto

README.md

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+AndroidTranscoder
+=================
+
+Hardware accelerated transcoder for Android, written in pure Java.
+
+## Usage
+
+```
+@Override
+protected void onActivityResult(int requestCode, int resultCode, Intent data) {
+    ParcelFileDescriptor parcelFileDescriptor = resolver.openFileDescriptor(data.getData(), "r");
+    FileDescriptor fileDescriptor = parcelFileDescriptor.getFileDescriptor();
+    MediaTranscoder.getInstance().transcodeVideo(fileDescriptor, file.getAbsolutePath(), new MediaTranscoder.Listener() {
+        @Override
+        public void onTranscodeProgress(double progress) {
+            ...
+        }
+
+        @Override
+        public void onTranscodeCompleted() {
+            startActivity(new Intent(Intent.ACTION_VIEW).setDataAndType(Uri.fromFile(file), "video/mp4"));
+            ...
+        }
+
+        @Override
+        public void onTranscodeFailed(Exception exception) {
+            ...
+        }
+    }
+}
+```
+
+See `TranscoderActivity.java` in example directory for ready-made transcoder app.
+
+## License
+
+```
+Copyright (C) 2014 Yuya Tanaka
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+```