Add security considerations and mitigations

[justin-tay]

Add some details on security considerations and mitigations and some implementations.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 93.75000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 78.02%. Comparing base (48ca3c2) to head (46126f9).
Report is 42 commits behind head on master.

Files	Patch %	Lines
...tworknt/schema/resource/ClasspathSchemaLoader.java	83.33%	1 Missing and 1 partial ⚠️

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Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1079      +/-   ##
============================================
- Coverage     78.90%   78.02%   -0.89%     
- Complexity     1965     2060      +95     
============================================
  Files           172      201      +29     
  Lines          6352     6875     +523     
  Branches       1255     1255              
============================================
+ Hits           5012     5364     +352     
- Misses          867     1032     +165     
- Partials        473      479       +6     

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