Updated readme.

README.md

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+# Ranobe lib dumper
+
+First we need to install their PWA web-site as an application on our phone.
+
+Once it's done, we can choose ranobe we want to download and click to download it. 
+
+
+Once ranobe is loaded, we need to connect android phone using ADB.
+
+```bash
+adb devices # Should show your device
+
+mkdir books
+cd books
+# Then we can download all books downloaded so far.
+adb pull sdcard/Android/data/ru.libappc/files/book/
+```
+
+Once book directory with ton of zip files is loaded, we can run the script:
+
+```bash
+python main.py -i books/20818--lord-of-the-mysteries --volume 5 -c ~/vol-5-cover.png
+```
+
+You can see all volumes by running:
+```
+ls | grep "v*.zip" | cut -d'-' -f1 | sort -u
+```
+
+It should show you all volume numbers with `v` prefix.