Add documentation for Databases Plugin

Summary: ^^

Reviewed By: jknoxville

Differential Revision: D15666190

fbshipit-source-id: 4b2f5c5544820baa4654b4e52a7e75bd275facc1

docs/setup/databases-plugin.md

@@ -0,0 +1,63 @@
+---
+id: databases-plugin
+title: Databases Plugin Setup
+sidebar_label: Databases
+---
+
+To use the databases plugin, you need to add the plugin to your Flipper client instance. The plugin is currently only available for Android.
+
+## Android
+
+Instantiate and add the plugin in `FlipperClient`.
+```java
+import com.facebook.flipper.plugins.crashreporter.DatabasesPlugin;
+
+client.addPlugin(new DatabasesFlipperPlugin(context));
+```
+
+By default it will list all sqlite databases returned by the context. If you are storing a sqlite database somewhere else, you can specify a `File` to it:
+
+```java
+client.addPlugin(new DatabasesFlipperPlugin(new SqliteDatabaseDriver(context, new SqliteDatabaseProvider() {
+    @Override
+    public List<File> getDatabaseFiles() {
+        List<File> databaseFiles = new ArrayList<>();
+        for (String databaseName : context.databaseList()) {
+            databaseFiles.add(context.getDatabasePath(databaseName));
+        }
+        databaseFiles.add("...path_to_your_db...")
+        return databaseFiles;
+    }
+})));
+```
+
+If you use a different type of database other than sqlite, you can implement a driver to be able to access it via Flipper. 
+
+```java 
+client.addPlugin(new DatabasesFlipperPlugin(new DatabaseDriver(context) {
+    @Override
+    public List getDatabases() {
+        return null;
+    }
+
+    @Override
+    public List<String> getTableNames(DatabaseDescriptor databaseDescriptor) {
+        return null;
+    }
+
+    @Override
+    public DatabaseGetTableDataResponse getTableData(DatabaseDescriptor databaseDescriptor, String table, String order, boolean reverse, int start, int count) {
+        return null;
+    }
+
+    @Override
+    public DatabaseGetTableStructureResponse getTableStructure(DatabaseDescriptor databaseDescriptor, String table) {
+        return null;
+    }
+
+    @Override
+    public DatabaseExecuteSqlResponse executeSQL(DatabaseDescriptor databaseDescriptor, String query) {
+        return null;
+    }
+    }));
+```