Add docs (#177)

Author: gordonwatts

.vscode/settings.json

@@ -11,6 +11,7 @@
         "codecov",
         "consts",
         "databanks",
+        "dataclass",
         "dataframes",
         "Dlib",
         "elts",

README.md

@@ -44,7 +44,8 @@ There are several python expressions and idioms that are translated behind your
 --- | --- | --- |
 |List Comprehension | `[j.pt() for j in jets]` | `jets.Select(lambda j: j.pt())` |
 |List Comprehension | `[j.pt() for j in jets if abs(j.eta()) < 2.4]` | `jets.Where(lambda j: abs(j.eta()) < 2.4).Select(lambda j: j.pt())` |
-|List Comprehension | `[j.pt()+e.pt() for j in jets for e in electrons]` | `jets.Select(lambda j: electrons.Select(lambda e: j.pt()+e.pt())` |
+| Data Classes<br>(typed) | `@dataclass`<br>`class my_data:`<br>`x: ObjectStream[Jets]`<br><br>`Select(lambda e: my_data(x=e.Jets()).x)` | `Select(lambda e: {'x': e.Jets()}.x)` |
+| Named Tuple<br>(typed) | `class my_data(NamedTuple):`<br>`x: ObjectStream[Jets]`<br><br>`Select(lambda e: my_data(x=e.Jets()).x)` | `Select(lambda e: {'x': e.Jets()}.x)` |
 
 Note: Everything that goes for a list comprehension also goes for a generator expression.