Added docs and generalized to multiple species

docs/build/html/_sources/guide/quickstart.rst.txt

@@ -0,0 +1,36 @@
+.. _quickstart:
+
+***************
+Getting Started
+***************
+
+Here is a quick example of how to fit an xml thermodynamic model to experimental data.
+
+This code fits Nd standard enthalpy in the "twophase.xml" cantera file to the 
+experimental data in "Nd_exp_data.csv".
+
+The code then produces a parity plot of the measured and predicted concentrations of Nd 3+ in the 
+aqueous phase.
+
+.. code-block:: python
+
+	from reeps import REEPS
+
+	searcher_parameters = {'exp_csv_filename': 'Nd_exp_data.csv',
+						   'phases_xml_filename': 'twophase.xml',
+						   'opt_dict': {'Nd(H(A)2)3(org)': {'h0': -4.7e6}},
+						   'phase_names': ['HCl_electrolyte', 'PC88A_liquid'],
+						   'aq_solvent_name': 'H2O(L)',
+						   'extractant_name': '(HA)2(org)',
+						   'diluant_name': 'dodecane',
+						   'complex_names': ['Nd(H(A)2)3(org)'],
+						   'rare_earth_ion_names': ['Nd+++'],
+						   'aq_solvent_rho': 1000.0,
+						   'extractant_rho': 960.0,
+						   'diluant_rho': 750.0}
+	searcher = REEPS(**searcher_parameters)
+	est_enthalpy = searcher.fit()
+	searcher.update_xml(est_enthalpy)
+	searcher.parity_plot(print_r_squared=True)
+	
+The code should return something like this