add documentation

LICENSE

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+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.

README.md

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+# AWS Application and Network Load Balancer (ALB & NLB) Terraform module
+
+Terraform module which creates Application and/or Network Load Balancer resources in AWS.
+
+These types of resources are supported:
+
+* [Load Balancer](https://www.terraform.io/docs/providers/aws/r/lb.html)
+
+## Terraform versions
+
+Terraform 0.12. Pin module version to `~> v1.0`. Submit pull-requests to `master` branch.
+
+## Usage
+
+### Application Load Balancer (HTTP and HTTPS listeners)
+
+```hcl
+module "alb" {
+  source = "umotif-public/alb/aws"
+  version = "~> 1.0.0"
+  
+  name_prefix = "complete-alb"
+
+  load_balancer_type = "application"
+
+  internal = false
+  vpc_id             = "vpc-abasdasd132"
+  subnets            = ["subnet-abasdasd132123", "subnet-abasdasd132123132"]
+
+  access_logs = {
+    bucket = "alb-logs"
+  }
+
+  tags = {
+    Project = "Test"
+  }
+}
+```
+
+
+## Assumptions
+
+Module is to be used with Terraform > 0.12.
+
+## Examples
+
+* [Application Load Balancer ALB](https://github.com/umotif-public/terraform-aws-alb/tree/master/examples/alb)
+
+## Authors
+
+Module managed by [Marcin Cuber](https://github.com/marcincuber) [linkedin](https://www.linkedin.com/in/marcincuber/).
+
+## License
+
+See LICENSE for full details.