add: syntax and api document

app/src/main/java/com/stardust/scriptdroid/DocumentActivity.java

@@ -0,0 +1,50 @@
+package com.stardust.scriptdroid;
+
+import android.os.Bundle;
+import android.support.v7.widget.Toolbar;
+import android.view.View;
+
+import com.stardust.scriptdroid.file.FileUtils;
+import com.stardust.view.MarkdownView;
+
+/**
+ * Created by Stardust on 2017/2/1.
+ */
+
+public class DocumentActivity extends BaseActivity {
+
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setUpUI();
+    }
+
+    private void setUpUI() {
+        setContentView(R.layout.activity_document);
+        setUpToolbar();
+        loadDocument();
+    }
+
+    private void loadDocument() {
+        MarkdownView markdownView = $(R.id.markdown);
+        try {
+            markdownView.loadMarkdown(FileUtils.readString(getResources().openRawResource(R.raw.document)));
+        } catch (Exception e) {
+            e.printStackTrace();
+            markdownView.setText("文档加载失败/(ㄒoㄒ)/~~");
+        }
+    }
+
+    private void setUpToolbar() {
+        Toolbar toolbar = $(R.id.toolbar);
+        toolbar.setTitle(R.string.text_syntax_and_api);
+        setSupportActionBar(toolbar);
+        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
+        toolbar.setNavigationOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                finish();
+            }
+        });
+    }
+}