added readme

readme.md

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+# Install pip packages
+
+Probably in a virtual env... *only the opencv packages are needed.* Others are
+optional.
+
+`pip install -r requirements.txt`
+
+# Run script:
+
+`python3 label_v2.py`
+
+
+Try to click only on ones that are moving. Doing some while they are just
+resting is okay but mostly I need the ones that are moving around on the
+screen. Also try to only include one or if you include two, click on each
+seperately.