Extract keywords from probability distribution essay type questions

See merge request !65

Send OTP number with email

See merge request !64

Create a method to generate 4 digit OTP number and verification UI

See merge request !61

Extract dataset for do the probability distribution questions with dataset

See merge request !62

Created  the input method for probability distribution

See merge request !63

Updated code for DescriptiveStatisticsQuestionComparation and StandardDeviationQuestionComparation classes

See merge request !60

Updated DescriptiveStatisticsQuestionComparation class and StandardDeviationQuestionComparation class

Fixed the Issue in Standarad deviation - essey problem error

See merge request !59

# Conflicts:
#	app/src/main/java/com/elearning/probabilityandstatisticsanalyserandeducator/inputMethod/DescriptiveSCinputMethod.java

Fixed the null pointer exception when radio button is not selected on standarad deviation

See merge request !58

# Conflicts:
#	app/src/main/java/com/elearning/probabilityandstatisticsanalyserandeducator/inputMethod/DescriptiveSCinputMethod.java
#	app/src/main/java/com/elearning/probabilityandstatisticsanalyserandeducator/inputMethod/StandardDeviationInputMethod.java

Completed initial exams for 6 categories

See merge request !56

Changed the extract dataset regex pattern for essay type questions in descriptive statistics and standard deviation

See merge request !57

Change regex pattern in ExtractDatasetFromDesQuestion method in DescriptiveStatisticsQuestionComparation class

Extract matching keywords from standard deviation essay type questions

See merge request !55

Update in Essay questions - part 3

See merge request !54

Newly updated keywords list in Descriptive statistics Question Comparation class

See merge request !53