Doc: basic lttng ust python agent documentation

Signed-off-by: Jonathan Rajotte <jonathan.rajotte-julien@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

diff --git a/doc/python-agent.txt b/doc/python-agent.txt
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+======================
+ Using the python agent
+======================
+
+To build the agent:
+
+$ ./configure --enable-python-agent
+
+The configure script is set to look for the first python version >= 2.7.
+To build the agent against another version of python:
+
+$ export PYTHON=<python path>
+$ ./configure --enable-python-agent