Add documentation and source

Added documentation, source and extra files.

source/orm/library/admin/book.py

@@ -0,0 +1,16 @@
+from django.contrib import admin
+
+from library.models import Book
+
+
+@admin.register(Book)
+class BookAdmin(admin.ModelAdmin):
+    """
+    Admin for books.
+
+    """
+
+    list_display = ["id", "name", "isbn", "genre", "year"]
+    list_editable = ["year", "genre"]
+    list_filter = ["genre"]
+    list_per_page = 25