Adds ClearlyDefined Data Importing Functions

Adds postgres.py to connect to and fetch data from postgres database.
Adds load_results_file.py and load_results_package.py for loading scancode results
data into MultiIndexed Pandas DataFrames.
Adds .ipynb files for each file, to explain code and show the DataFrames.

Signed-off-by: Ayan Sinha Mahapatra <ayansmahapatra@gmail.com>

.gitignore

@@ -0,0 +1,9 @@
+.idea/
+.ipynb_checkpoints/
+**hdf5/
+**.h5
+src/notebooks/junk*
+src/results_analyze/__init__.py
+src/results_analyze/__pycache__/
+src/notebooks/dask-worker-space/
+src/results_analyze/data/credentials.json