docs: add package readme for svm

sklearn_pmml_model/svm/README.md

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+# sklearn-pmml-model.svm
+
+This package contains the `PMMLLinearSVC`, `PMMLNuSVC` and `PMMLSVC` classifier models, as well as the `PMMLLinearSVR`, `PMMLNuSVR` and `PMMLSVR` regression models. 
+
+## Example
+A minimal working example is shown below:
+
+```python
+import pandas as pd
+from sklearn_pmml_model.svm import PMMLSVC
+
+# Prepare data
+df = pd.read_csv('models/categorical-test.csv')
+Xte = df.iloc[:, 1:]
+Xte = pd.get_dummies(Xte, prefix_sep='')  # create categorical variable
+
+clf = PMMLSVC(pmml="models/svc_cat_pima.pmml")
+clf.predict(Xte)
+```