update readme

README.md

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 # Android-Libs
-Andriod base library
+
+## modules
+
+- lib_base：common util classes and base classes，including BaseActivity, BaseFragment, BaseStateFragment, BaseListFragment, BaseAdapter, MVVM, MVP, MultiStateView, Dagger2, AAC, RxJava2, Kotlin, etc.
+- lib_media_selector：gets photos or videos from system.
+- lib_qrcode：library for scanning and generating qrcode.
+- lib_network：RxJava + Retrofit + OkHttp.
+- lib_cache： DiskLruCache + MMKV.
+
+## how to use
+
+refer [AndroidArchitecture](https://github.com/Ztiany/AndroidArchitecture)