Workflow, phpstan, codesniffer added

v0.2.8

fix

Graph made iterable

v0.1.7

make graph iterable

Graph data structure added

v0.1.6

graph struct ready

delete() method updated for MappedCollection

v0.1.5

delete method updated for MappedCollection

Method "exist()" added to SortedMappedLinkedList

v0.1.4

exist method added to sorted mapped linked list

Refresh method added for presorted containers

v0.1.3

refresh method for presorted containers

Some methods renamed

v0.1.2

pop renamed to delete

First release

v0.1.1

readme upd