Add Security Policy

[web3security]

Description

Add missing standard Polygon Security Policy as part of internal security audit.

Changes include

• Bugfix (non-breaking change that solves an issue)
• Hotfix (change that solves an urgent issue, and requires immediate attention)
• New feature (non-breaking change that adds functionality)
• Breaking change (change that is not backwards-compatible and/or changes current functionality)
• Documentation update (NEW)

Checklist

• I have assigned this PR to myself
• I have added at least 1 reviewer
• I have added the relevant labels
• I have added sufficient documentation in code
• Team members should confirm this PR before merge

Additional comments

As discussed in Slack channel wg_edge_audits, AppSec team is creating different PRs along Edge/Supernets teams' repos to add the missing standard Security Policy.

[mt-polygon-technology]

looks good

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
No Duplication information

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.01%. Comparing base (081b97a) to head (61b29aa).
Report is 10 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #75      +/-   ##
==========================================
+ Coverage   88.61%   89.01%   +0.39%     
==========================================
  Files           7        7              
  Lines        1520     1520              
==========================================
+ Hits         1347     1353       +6     
+ Misses        132      128       -4     
+ Partials       41       39       -2     

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