chore: Add Linux dev. pre-requisites to README

[traeok]

What It Does

This PR adds instructions to install the required development packages to build Zowe CLI from source, namely for developers running Linux.

These packages are needed to compile the Secrets SDK on Linux distributions.

How to Test

• On Linux, install the packages in the README section "Building Zowe CLI from source"
• Once those packages have been installed, try to build the repository: npm install && npm run build

Review Checklist
I certify that I have:

• tested my changes
• added/updated automated tests
• updated the changelog
• followed the contribution guidelines

[t1m0thyj]

LGTM, thanks @traeok!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (dd55a9e) 91.03% compared to head (e6e2b89) 91.03%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1989   +/-   ##
=======================================
  Coverage   91.03%   91.03%           
=======================================
  Files         636      636           
  Lines       18718    18718           
  Branches     3900     3900           
=======================================
  Hits        17040    17040           
  Misses       1677     1677           
  Partials        1        1           

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[sonarqubecloud]

Quality Gate passed

Kudos, no new issues were introduced!

0 New issues
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarCloud