Update README.md [no ci]

Author: pedromxavier

README.md

@@ -7,49 +7,42 @@
     <br>
 </div>
 
-## Introduction
-
-This package provides a wrapper around [QUBOLibData.jl](https://github.com/pedromxavier/QUBOLibData.jl)'s artifact to easily access QUBO / Ising instances.
-Instances are retrieved as model objects from [QUBOTools.jl](https://github.com/psrenergy/QUBOTools.jl).
-
 ## Getting Started
 
 ### Installation
 
 ```julia
-julia> import Pkg; Pkg.add(url="https://github.com/pedromxavier/QUBOLib.jl")
+julia> import Pkg; Pkg.add(url="https://github.com/JuliaQUBO/QUBOLib.jl")
 
 julia> using QUBOLib
 ```
 
 ### Example
 
 ```julia
-julia> coll = first(list_collections())   # get code of the first registered collection
-
-julia> inst = first(list_instances(coll)) # get code of the first instance from that collection
+julia> using QUBOLib
 
-julia> model = load_instance(coll, inst)  # retrieve QUBOTools model
+julia> QUBOLib.access() do index
+           println(index)
+       end
 ```
 
 ## Accessing the instance index database
 
 > **Warning**
 > This requires [SQLite.jl](https://github.com/JuliaDatabases/SQLite.jl) and [DataFrames.jl](https://github.com/JuliaData/DataFrames.jl) to be installed.
 
-
 ```julia
-julia> using SQLite, DataFrames
+julia> using QUBOLib
 
-julia> db = QUBOLib.database()
+julia> using SQLite, DataFrames
 
-julia> df = DBInterface.execute(
-           db,
-           "SELECT collection, instance FROM instances WHERE size BETWEEN 100 AND 200;"
-       ) |> DataFrame
+julia> models = QUBOLib.access() do index
+           df = DBInterface.execute(
+               QUBOLib.database(index),
+               "SELECT instance FROM Instances WHERE size BETWEEN 100 AND 200;"
+           ) |> DataFrame
 
-julia> models = [
-           load_instance(coll, inst)
-           for (coll, inst) in zip(df[!, :collection], df[!, :instance])
-       ]
+           return [load_instance(index, i) for i in df[!, :instance]]
+       end
 ```