[doc] add bootstrap

doc/README-billing.org

@@ -1,4 +1,7 @@
 * How to handle billing in general
+** Manual test flow / setting up bills
+   - Needs orders
+     -
 ** Orders
    - Orders are the heart of uncloud billing
    - Have a starting date

doc/uncloud-manual-2020-08-01.org

@@ -1,4 +1,11 @@
-* Templates
+* Bootstrap
+  - Login via a user so that the user object gets created
+  - Run the following (replace nicocustomer with the username)
+   #+BEGIN_SRC sh
+   python manage.py bootstrap-user --username nicocustomer
+   #+END_SRC
+
+
 * Testing / CLI Access
   Access via the commandline (CLI) can be done using curl or
   httpie. In our examples we will use httpie.
@@ -13,3 +20,16 @@
 
 * URLs
   - api/ - the rest API
+* Models
+** Bill
+   Bills are summarising usage in a specific timeframe. Bills usually
+   spawn one month.
+** BillRecord
+   Bill records are used to model the usage of one order during the
+   timeframe.
+** Order
+   Orders register the intent of a user to buy something. They might
+   refer to a product. (???)
+   Order register the one time price and the recurring price. These
+   fields should be treated as immutable. If they need to be modified,
+   a new order that replaces the current order should be created.