Add environment variable documentation for CLI

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+> `JustEnoughVCS` CLI Environments
+
+## Usage
+Environment variables can be set before invoking a command. 
+The usage depends on your system:
+
+**Linux/macOS (Bash/Zsh, etc.):**
+__  JV\_KEY=value jvn <subcommand>
+
+**Windows (Command Prompt):**
+__  set JV\_KEY=value && jvn <subcommand>
+
+**Windows (PowerShell):**
+__  $env:JV\_KEY="value"; jvn <subcommand>
+
+## Environment Variables
+`jvn` provides several environment variables to 
+__  control certain behaviors of the command line.
+
+### Default Text Editor
+**Key**: JV\_TEXT\_EDITOR
+**Value**: [Program]
+
+Example:
+__  JV\_TEXT\_EDITOR="nano"
+
+### Help Documentation Viewer
+**Key**: JV\_HELPDOC\_VIEWER
+**Value**: [Enable: 1] or [Disable: 0]
+
+Example:
+__  # Turn off help documentation viewer output
+__  JV\_HELPDOC\_VIEWER=0 jvn -h
+
+### Language
+**Key**: JV\_LANG
+**Value**: [Language]
+
+Example:
+__  JV\_LANG=en jvn -v
+
+### Pager
+**Key**: JV\_PAGER
+**Value**: [Program]
+
+Example:
+__  JV\_PAGER="less"