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feat: restructure docs into "chapters" (#12)

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# Time & Datetime
## Time
```py
# epoch: elapsed time in seconds (in UNIX starts from 01-010-1970)
import time # UNIX time
variable = time.time () # returns the time (in seconds) elapsed since 01-01-1970
variable = time.ctime (epochseconds) # transform epoch into date
var = time.perf_counter () # returns the current running time
# execution time = start time - end time
```
### time.srtfrime() format
| Format | Data |
|--------|------------------------------------------------------------------------------------------------------------|
| `%a` | Locale's abbreviated weekday name. |
| `%A` | Locale's full weekday name. |
| `%b` | Locale's abbreviated month name. |
| `%B` | Locale's full month name. |
| `%c` | Locale's appropriate date and time representation. |
| `%d` | Day of the month as a decimal number `[01,31]`. |
| `%H` | Hour (24-hour clock) as a decimal number `[00,23]`. |
| `%I` | Hour (12-hour clock) as a decimal number `[01,12]`. |
| `%j` | Day of the year as a decimal number `[001,366]`. |
| `%m` | Month as a decimal number `[01,12]`. |
| `%M` | Minute as a decimal number `[00,59]`. |
| `%p` | Locale's equivalent of either AM or PM. |
| `%S` | Second as a decimal number `[00,61]`. |
| `%U` | Week number of the year (Sunday as the first day of the week) as a decimal number `[00,53]`. |
| `%w` | Weekday as a decimal number `[0(Sunday),6]`. |
| `%W` | Week number of the year (Monday as the first day of the week) as a decimal number `[00,53]`. |
| `%x` | Locale's appropriate date representation. |
| `%X` | Locale's appropriate time representation. |
| `%y` | Year without century as a decimal number `[00,99]`. |
| `%Y` | Year with century as a decimal number. |
| `%z` | Time zone offset indicating a positive or negative time difference from UTC/GMT of the form +HHMM or -HHMM |
| `%Z` | Time zone name (no characters if no time zone exists). |
| `%%` | A literal `%` character. |
## Datetime
```py
import datetime
today = datetime.date.today () # returns current date
today = datetime.datetime.today () # returns the current date and time
# formatting example
print ('Current Date: {} - {} - {}' .format (today.day, today.month, today.year))
print ('Current Time: {}: {}. {}' .format (today.hour, today.minute, today.second))
var_1 = datetime.date (year, month, day) # create date object
var_2 = datetime.time (hour, minute, second, micro-second) # create time object
dt = datetime.combine (var_1, var_2) # combine date and time objects into one object
date_1 = datetime.date ('year', 'month', 'day')
date_2 = date_1.replace (year = 'new_year')
#DATETIME ARITHMETIC
date_1 - date_2 # -> datetime.timedelta (num_of_days)
datetime.timedelta # duration expressing the difference between two date, time or datetime objects
```