Merge branch 'develop' into 'master'

Develop

See merge request !3

README.md

@@ -15,6 +15,17 @@ echo 'deb https://apt.clarin-pl.eu/ /' > /etc/apt/sources.list.d/clarin.list
 apt-get update && apt-get install corpus2-python3.6
 ```
 
+It is also possible to use a docker:
+
+```
+FROM clarinpl/python:3.6
+
+RUN apt-get update && apt-get install -y \
+    corpus2-python3.6
+
+RUN pip install --upgrade pip && pip install cclutils
+```
+
 Install
 =======
 
@@ -168,4 +179,19 @@ True
 >>> token.set_wa(False)
 >>> token.after_space()
 False
+```
+
+Sentence manipulation
+=====================
+
+1. Prints out sentences of a given document
+
+```python
+document = cclutils.read('./example.xml')
+
+sentences = (sentence for paragraph in document.paragraphs()
+    for sentence in paragraph.sentences())
+    
+for sentence in sentences:
+    print(cclutils.sentence2str(sentence))
 ```
\ No newline at end of file