docs: added documentation for environment command

docs/cli/environment.md

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+---
+description: The `environment` command
+---
+
+# `environment`
+
+The `environment` command is used to manage environments in Keyshade. An environment is a context in which secrets are stored and accessed. It has a set of subcommands:
+
+- [`create`](#create): This command is used to create a new environment.
+- [`delete`](#delete): This command is used to delete an existing environment.
+- [`get`](#get): This command is used to get details of a specific environment.
+- [`list`](#list): This command is used to list all environments.
+- [`update`](#update): This command is used to update the properties of an existing environment.
+
+## Usage
+
+```bash
+keyshade environment <subcommand> [options]
+```
+
+## `create`
+
+### Usage
+
+```bash
+keyshade environment create <project-slug> [options]
+```
+
+### Arguments
+
+These are the arguments supported by the update command:
+
+#### `<project-slug>`
+
+The slug of the project under which you want to add the environment.
+
+### Options
+
+These are the options supported by the `create` command:
+
+#### `-n, --name <string>`
+
+The name of the environment.
+
+#### `-d, --description <string>`
+
+A description of the environment.
+
+## `delete`
+
+### Usage
+
+```bash
+keyshade environment delete <environment-id> [options]
+```
+
+### Arguments
+
+#### `<environment-id>`
+
+The ID of the environment which you want to delete.
+
+## `get`
+
+### Usage
+
+```bash
+keyshade environment get <environment-slug> [options]
+```
+
+### Arguments
+
+#### `<environment-slug>`
+
+Slug of the environment which you want to fetch.
+
+## `list`
+
+### Usage
+
+```bash
+keyshade environment list <project-slug> [options]
+```
+
+### Arguments
+
+These are the arguments supported by the update command:
+
+#### `<project-slug>`
+
+Slug of the project whose environments you want.
+
+### Options
+
+These are the options supported by the `create` command:
+
+#### `PAGINATION_OPTION`
+
+The `list` command supports pagination options. These options are defined in the `PAGINATION_OPTION` constant.
+
+## `update`
+
+### Usage
+
+```bash
+keyshade environment update <environment-slug> [options]
+```
+
+### Arguments
+
+#### `<environment-slug>`
+
+Slug of the environment which you want to update.
+
+### Options
+
+These are the options that might be supported by the `update` command:
+
+#### `-n, --name <string>`
+
+The new name for the environment.
+
+#### `-d, --description <string>`
+
+The new description for the environment.
+