[FEATURE] create parser for queries

[git-user-cpp]

implement parser for database.

data in format	data out format
regular string	not (yet) crypted text file
db command	db action
" cr 'db1' "	creates file db1.txt
" dl 'db1' "	removes file db1.txt
" run 'db1' "	uses db1.txt as current db
table command	table action
" cr tab 'tab1' "	creates table
" rd tab 'tab1' "	reads table
" up tab 'tab1' "	updates table
" dl tab 'tab1' "	removes table
row command	row action
" cr row 'row1' "	creates row
" rd row 'row1' "	reads row
" up row 'row1' "	updates row
" dl row 'row1' "	removes row
column command	column action
" cr row 'row1', 'hello' "	1 hello
" rd row 'row1', 1"	hello
" up row 'row1', 'hello', 'bye' "	2 bye
" dl row 'row1', 'bye' "	empty file

in directory src/queries implement parser for database queries, use CRUD pattern (create, read, update, delete). in general, the goal is to implement first working version of parser.

the commands ain't perfect so they can be implemented differently. for example queries can look like SQL's INSERT, UPDATE, DELETE, CREATE etc.

also, don't forget to use doc comments for building nice documentation later (however, if u want I can do that)