doc: new outline for docs

docs/optlang.rst

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+============================
+The optlang solver interface
+============================
+
+`optlang`_ is a generic interface solver interface to . It is based on the
+
+.. _optlang: http://biosustain.github.io/optlang/

docs/solver_interface.rst

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+============
+Dependencies
+============
+
+For efficiency reasons, cameo does not utilize the cobrapy's interface to LP and MILP solver. Instead it utilizes
+optlang.
+
+
+Changing the solver
+==================
+
+The LP/MILP solver can be changed in the following way.
+
+.. code-block:: python
+
+    model.solver = 'cplex'
+
+Currently `'cplex'` and `'glpk' are supported.
+
+cameo (load models from different formats):
+
+.. code-block:: python
+
+    from cameo import load_model
+    # read SBML model
+    model = load_model('path/to/model.xml')
+    # ... or read a pickled model
+    model = load_model('path/to/model.pickle')
+    # ... or just import a model by ID from http://darwin.di.uminho.pt/models
+    iAF1260 = load_model('iAF1260')
+
+
+Manipulating the solver object
+------------------------------
+
+
+~~~~~~~