Commit 035656f

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add storage class for handling file operations

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	`1`	`+module Amnesia`
	`2`	`+ class Storage`
	`3`	`+ def initialize(filename)`
	`4`	`+ @filename = filename`
	`5`	`+ end`
	`6`	`+`
	`7`	`+ def set(key, value)`
	`8`	`+ File.write(@filename, "#{key},#{value}\n", mode: 'a+')`
	`9`	`+ end`
	`10`	`+`
	`11`	`+ def get(key)`
	`12`	`+ lines = File.readlines(@filename)`
	`13`	`+`
	`14`	`+ result = lines.filter do \|line\|`
	`15`	`+ record_key, = line.split(',', 2)`
	`16`	`+ record_key == key`
	`17`	`+ end`
	`18`	`+`
	`19`	`+ result.last.split(',', 2)[1]`
	`20`	`+ end`
	`21`	`+`
	`22`	`+ def create_db_file`
	`23`	`+ File.write(@filename, '') unless file_exists?`
	`24`	`+ end`
	`25`	`+`
	`26`	`+ def file_exists?`
	`27`	`+ File.exist?(@filename)`
	`28`	`+ end`
	`29`	`+ end`
	`30`	`+end`

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