add matrix output to README example

Author: pazzo83

README.md

@@ -33,6 +33,13 @@ MLJ.fit!(mach)
 tfidf_mat = transform(mach, tokenize.(docs))
 ```
 
+The resulting matrix looks like:
+```
+2×11 adjoint(::SparseArrays.SparseMatrixCSC{Float64, Int64}) with eltype Float64:
+ 0.234244  0.0       0.234244  0.0       0.234244  0.0       0.234244  0.234244  0.234244  0.0       0.0
+ 0.0       0.281093  0.0       0.281093  0.0       0.281093  0.0       0.0       0.0       0.281093  0.281093
+ ```
+
 Functionality similar to Scikit-Learn's implementation with N-Grams can easily be implemented using features from `TextAnalysis`.  Then the N-Grams themselves (either as a dictionary of Strings or dictionary of Tuples) can be passed into the transformer.  We will likely introduce an additional transformer to handle these types of conversions in a future update to `MLJText`.
 ```julia