add docs

Author: joaquimg

docs/src/analyzer.md

@@ -22,3 +22,15 @@ and summarize them individually. The following functions are useful for this:
 ModelAnalyzer.list_of_issue_types
 ModelAnalyzer.list_of_issues
 ```
+
+It is possible to extract data from the issues with the methods:
+
+```@docs
+ModelAnalyzer.variables
+ModelAnalyzer.variable
+ModelAnalyzer.constraints
+ModelAnalyzer.constraint
+ModelAnalyzer.set
+ModelAnalyzer.values
+ModelAnalyzer.value
+```

docs/src/index.md

@@ -129,3 +129,17 @@ ModelAnalyzer.summarize(issues)
 # individual issues can also be summarized
 ModelAnalyzer.summarize(issues[1])
 ```
+
+### Non JuMP (or MOI) models
+
+If you dont have a JuMP (or MOI) model, you can still use this package reading from a file.
+
+```julia
+model = Model();
+@variable(model, x >= 0);
+@objective(model, Min, 2 * x + 1);
+filename = joinpath(mktempdir(), "model.mps");
+write_to_file(model, filename; generic_names = true)
+new_model = read_from_file(filename; use_nlp_block = false)
+print(new_model)
+```