Added MITRE documentation in README

[danielsagi]

Description

Added MITRE Matrix picture to simulate kube-hunter tests

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AFTER

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• [ ] I have read the Contributing Guidelines.
• [ ] The commits refer to an active issue in the repository.
• [ ] I have added automated testing to cover this case.

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[codecov[bot]]

Codecov Report

Merging #485 (c45f612) into main (473e4fe) will increase coverage by 2.35%. The diff coverage is 87.59%.

:exclamation: Current head c45f612 differs from pull request most recent head d90c99c. Consider uploading reports for the commit d90c99c to get more accurate results

@@            Coverage Diff             @@
##             main     #485      +/-   ##
==========================================
+ Coverage   63.67%   66.03%   +2.35%     
==========================================
  Files          43       46       +3     
  Lines        2431     2644     +213     
==========================================
+ Hits         1548     1746     +198     
- Misses        883      898      +15     

Impacted Files	Coverage Δ
kube_hunter/modules/hunting/cves.py	81.03% <ø> (+2.93%)	:arrow_up:
kube_hunter/modules/hunting/etcd.py	33.75% <ø> (ø)
kube_hunter/modules/hunting/kubelet.py	60.40% <ø> (ø)
kube_hunter/modules/hunting/proxy.py	48.43% <ø> (ø)
kube_hunter/modules/report/base.py	30.30% <ø> (ø)
kube_hunter/modules/report/plain.py	12.50% <0.00%> (ø)
kube_hunter/core/types/hunters.py	65.21% <65.21%> (ø)
kube_hunter/modules/hunting/apiserver.py	72.34% <71.42%> (+1.92%)	:arrow_up:
kube_hunter/core/events/types.py	82.81% <80.00%> (-0.39%)	:arrow_down:
kube_hunter/core/types/vulnerabilities.py	93.67% <93.67%> (ø)
... and 17 more

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