feat: added environment page

docs/environment.mdx

@@ -1,4 +1,47 @@
 ---
 sidebar_label: Environment
 sidebar_position: 5
----
+---
+
+import { FiExternalLink } from "react-icons/fi";
+
+# Environment
+
+An environment is an abstraction that let us isolate the different resources managed by SleakOps.
+This isolation is based on criteria established by the users that can respond to different configurations and purposes.
+It helps in reproducing settings and assigning different responsibilities for each one of these environments.
+
+Some common use cases are to create environments based on the lifecycle of an application or different teams.
+This case might be implemented by creating environments for developers (dev), quality assurance (qa), stagging (stg) and production (prod).
+Each of these might have custom settings appropriate for the needs of different roles, such as developers and testers.
+Environments are independent of one another.
+
+A cluster must be selected to create an environment, hence that according to our [proposed architecture](/docs/provider/aws.mdx) the prod account must only contain production environments.
+The dev account must host all other non-productive environments.
+
+## Infrastructure created with an environment
+
+For an environment to function correctly it needs DNS resolution, so when an environment is created a secondary hosted zone is also created in the Route 53 service with the corresponding association.
+Remember that the primary zone was created during the [Provider](/docs/provider) creation and assigned to the prod account.
+
+You can read more about the Kubernetes resources that an environment creates in the next section.
+
+## Relationship with Projects
+
+Environment and projects are closely related as every matching between two might represent a namespace.
+Namespaces are resources represented in SleakOps, sometimes referred to as project_env.
+Namespace creation is triggered with the creation of [services](/docs/service/index.mdx) or [dependencies](/docs/dependency/index.mdx) resources.
+
+This namespace requires SleakOps to create:
+
+- A proper namespace inside the Kubernetes cluster of the environment.
+- A Kubernetes job to perform the [initial build image](/docs/project/initial-build.mdx).
+
+### Pricing
+
+In AWS the billing for environments is related to the [Route 53 <FiExternalLink/>](https://aws.amazon.com/route53/pricing/) service.
+
+In summary, the approximate cost is:
+
+- $0.50 per hosted zone per month.
+- $0.40 per million queries.