docs: updated readme for tm-extrctor lambda setup.

scripts/aws/lambda/TM-Extractor/README.md

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+<!-- GETTING STARTED -->
+## TM-Extractor with Terragrunt
+
+This directory contains infrastructure config for deploying [tm-extractor](https://github.com/hotosm/TM-Extractor) on AWS Lambda.
+
+Check [tm-extractor](https://github.com/hotosm/TM-Extractor) for resources created and exporter script.
+
+To get it running on your environment follow the following.
+
+### Prerequisites
+
+This are list of things you will need. 
+* AWS IAM User with permission for creating resources such as lambda function, cloudwatch group, cloudwatch event etc. 
+See all resource [here](https://github.com/hotosm/TM-Extractor/blob/ec37c1318325c534b4ac47f057263050e6e92f03/main.tf).
+* [Terraform](https://www.terraform.io/)
+* [Terragrunt](https://terragrunt.gruntwork.io/)
+
+### Environments
+
+Before running deployment, make sure you have the following environment variables exported.
+- `TF_VAR_rawdata_api_auth_token`, Auth token for raw data api, Request [here](https://github.com/hotosm/raw-data-api/).
+- `TF_VAR_raw_data_api`, API endpoint. Defaults to https://api-prod.raw-data.hotosm.org/v1
+- `TF_VAR_active_projects_api_base_url`, Your [tasking-manager](https://github.com/hotosm/tasking-manager) instance. 
+Defaults to https://tasking-manager-staging-api.hotosm.org/api/v2
+
+
+## Plan and Apply
+- `cd` into `scripts/aws/lambda/TM-Extractor/<your-environment-here>/tm-extractor`.
+- `terragrunt init`, initializes providers and resources.
+- `terragrunt plan`, run a plan to check for infrastructure changes.
+- `terragrunt apply`, applies the configuration.
+
+
+_For more information, please refer to the [TM-Extractor](https://github.com/hotosm/TM-Extractor)_ repository.
+
+<p align="right">(<a href="#readme-top">back to top</a>)</p>