Add Documentation

[JuliusMiller]

Description

Add Documentation for Local Planning

Fixes #112

Type of change

• Documentation

Does this PR introduce a breaking change?

No

Most important changes

Local_planning_for_first_milestone.md

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works (might be obsolete with CI later on)
• New and existing unit tests pass locally with my changes (might be obsolete with CI later on)

[github-actions]

Simulation results

Metric	Value
Avg. driving score	0.006825
Avg. route completion	0.015
Avg. infraction penalty	0.455
Collisions with pedestrians	0.0
Collisions with vehicles	0.0
Collisions with layout	930.763
Red lights infractions	0.0
Stop sign infractions	0.0
Off-road infractions	0
Route deviations	0.0
Route timeouts	930.763
Agent blocked	0.0
Yield emergency vehicles infractions	0.0
Scenario timeouts	930.763
Min speed infractions	0.0

[samuelkuehnel]

Nice documentation