Add notebook abc model showcase, add some pretty print functions

docs/src/lib/internals/models.md

@@ -10,6 +10,12 @@ Pages = ["models/interface.jl"]
 Order = [:type, :constant, :function]
 ```
 
+```@autodocs
+Modules = [MetagraphOptimization]
+Pages = ["models/print.jl"]
+Order = [:function]
+```
+
 ## ABC-Model
 
 ### Types
@@ -54,6 +60,13 @@ Pages = ["models/abc/compute.jl"]
 Order = [:function]
 ```
 
+### Print
+```@autodocs
+Modules = [MetagraphOptimization]
+Pages = ["models/abc/print.jl"]
+Order = [:function]
+```
+
 ## QED-Model
 
 *To be added*

docs/src/manual.md

@@ -1,3 +1,7 @@
 # Manual
 
-This will become a manual.
+## Jupyter Notebooks
+
+In the `notebooks` directory are notebooks containing some examples of the usage of this repository.
+
+- `abc_model_showcase`: A simple showcase of the intended usage of the ABC Model implementation.