Added contentstack utilities

Author: abhinav-from-contentstack

packages/contentstack-utilities/.editorconfig

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+root = true
+
+[*]
+indent_style = space
+indent_size = 2
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[*.md]
+trim_trailing_whitespace = false

packages/contentstack-utilities/.eslintrc

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+{
+  "extends": "oclif"
+}

packages/contentstack-utilities/README.md

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+@contentstack/cli-command
+===================
+
+[![License](https://img.shields.io/npm/l/@contentstack/cli)](https://github.com/contentstack/cli/blob/main/LICENSE)
+
+Base class for Contentstack CLI commands. Built off of [oclif](https://oclif.io). To get started with Contentstack CLI, refer to the [CLI documentation](https://www.contentstack.com/docs/developers/cli/).