Added solutions for finding narcissistic numbers for the given range

Added src/praveen/narcissistic.ts which contains solutions for finding narcissistic numbers for the given range
The file src/praveen/narcissistic.ts contains 2 functions - checkIfNarcissisticNumber and getNarcissisticNumbersWithinRange
Added src/praveen/narcissistic.test.ts for unit tests for the functions - checkIfNarcissisticNumber and getNarcissisticNumbersWithinRange
The file src/praveen/narcissistic.test.ts contains 2 test suites and 10 test cases.

unifystockx / code_compete