Readme update.

README.md

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+# TerraformOnboarding
+The purpose of the exportConfig.py script is to onboard dynatrace services by the help of a custom template. 
+
+
+# Setup
+Run the following command to install all necessary dependencies:
+
+```python
+pip install -r requirements.txt
+```
+
+In order to ensure full functionality a `.env` file is necessary with the following format:
+
+```
+CN_PREPROD_ENV_URL="https://dynatracemgd-cn.bmwgroup.net/e/ab88c03b-b7fc-45f0-9115-9e9ecc0ced35"
+CN_PROD_ENV_URL="https://dynatracemgd-cn.bmwgroup.net/e/b921f1b9-c00e-4031-b9d1-f5a0d530757b"
+EMEA_PREPROD_ENV_URL="https://qqk70169.live.dynatrace.com"
+EMEA_PROD_ENV_URL="https://xxu26128.live.dynatrace.com"
+NA_PREPROD_ENV_URL="https://onb44935.live.dynatrace.com"
+NA_PROD_ENV_URL="https://wgv50241.live.dynatrace.com"
+```
+Place the `.env` file within the root directory of the project folder:
+
+```bash
+TerraformOnboarding          # Project Folder
+├─── _dynatrace-base-modules # Required modules for templates
+├─── templates               # Templates
+├─── .env                    # Add the environment file here
+├─── .gitignore
+├─── README.md
+└─── requirements.txt
+```
+
+# Run
+You can simply run the script by executing the following example command within the projects root directory:
+
+```python
+python onboarding.py <dirname> <tag1,tag2,...>
+```
+**Note:** Please note that it is required to delimit the tags by a comma!
+
+Here is an example command:
+
+```python
+python onboarding.py CD_ASBC-PKI-DFP DFP,DFPH
+```
+In the above example command the directory is going to be created with the name **CD_ASBC-PKI-DFP** within a generated **./output** folder. The key values of the template files will be replaced wit the associated tags delimited by a comma in the shell. The generated files will be stored in subfolders of the **CD_ASBC-PKI-DFP** folder respectively.
+
+
+# Version
+```python
+Python 3.9.9
+```