Update README and add CHANGELOG with initial toolkits summary

CHANGELOG.md

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+# Changelog
+
+## [Initial Version]
+
+### Added
+
+- Repository structure:
+  - `infra-run`
+  - `platform-projects`
+  - `labs`
+- Linux operations Bash toolkit:
+  - healthcheck
+  - disk usage checks
+  - service checks
+  - system reporting
+- Disk full incident toolkit:
+  - disk analysis
+  - large files detection
+  - deleted open files detection
+  - safe cleanup suggestions
+- Network troubleshooting script:
+  - interface, routing, DNS, connectivity checks
+- Veritas storage toolkit:
+  - VxVM disk detection
+  - diskgroup extension
+  - volume/filesystem resize
+  - VCS freeze/unfreeze workflow
+- GPFS storage toolkit:
+  - cluster validation
+  - NSD planning
+  - filesystem expansion
+  - rebalance
+- Runbook-style structure and step-based execution.
+
+### Notes
+
+- All scripts default to dry-run where change actions are present.
+- Designed for safety and readability.
+- No destructive actions without explicit confirmation.