Test set analysis (#60)

* test set analysis

* added link to nbviewer in notebook

* deleted checkpoints

* Delete checkpoints

* delete metadata.csv

* using metadata from hugging face

* remove unused import

quartz_solar_forecast/dataset/README.md

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+## Test set analysis
+The test set contains the data used for testing the solar forecast models developed. It contains 2500 data points, with `pv_id` and `timestamps` of when the data was collected. Upon analysing the dataset, the following observations were made:
+1. The data is pretty evenly distrbuted throughout the year, with the highest number of data points from the month of May (256 data points)
+2. Looking at distribution by hour of the day, the highest number of data points is from 19:00 hrs (132 data points), and the least from 00:00 hrs (87 data points)
+
+By analysing the metadata, available at [Hugging Face](https://huggingface.co/datasets/openclimatefix/uk_pv), along with the test set, it can be observed that:
+1. Most of the data in the test set has a tilt angle of 30-34 degrees
+2. The maximum kwp is 4.0 & the minmum kwp is 2.25 in the test set.
+
+A detailed anaysis of the test set can be found at quartz_solar_forecast/dataset/dataset_analysis/test_set_analysis.ipynb