BR 209 post processing for CDBM approach

#### Description:
Method to post process results from an annual daylight simulation to give result against BR 209 criteria.

Input should be the results folder from an LBT annual daylight simulation.

Variables to consider is the room type



Here's an example of how I'm handling a single room atm

```python
ldk_results = []
for ill in ldk_ills:
print(ill)
df = load_ill_file(ill_file=ill)
df = df.T
median_per_timestep = df.median()
median_result = median_per_timestep>200
annual_result = median_result.sum()
annual_fraction = annual_result/4380
annual_pct = annual_fraction*100
ldk_results.append(annual_pct)
ldk_results
```