docs: Update the readme

README.md

@@ -4,8 +4,13 @@
 [![JetBrains IntelliJ plugins](https://img.shields.io/jetbrains/plugin/d/24761-infracost.svg)](https://plugins.jetbrains.com/plugin/24761-infracost)
 [![JetBrains IntelliJ plugins](https://img.shields.io/jetbrains/plugin/r/rating/24761-infracost.svg)](https://plugins.jetbrains.com/plugin/24761-infracost)
 
+
 ![Infracost JetBrains Plugin](.github/images/infracost.png)
 
+## Demo Video
+
+[![https://img.youtube.com/vi/kgfkdmUNzEo/0.jpg](https://img.youtube.com/vi/kgfkdmUNzEo/0.jpg)](https://www.youtube.com/watch?v=kgfkdmUNzEo)
+
 ## Description
 
 <!-- Plugin description -->
@@ -32,6 +37,57 @@ You can install the plugin from the JetBrains Plugin Repository.
 4. Restart the IDE
 5. Open a Terraform file and click on the `Infracost` tab at the bottom of the IDE
 6. Click on `Refresh` to get the cost estimate
-7. Use our ![CI/CD integrations](https://www.infracost.io/docs/integrations/cicd/) to add cost estimates to pull
+7. Use our [CI/CD integrations](https://www.infracost.io/docs/integrations/cicd/) to add cost estimates to pull
    requests. This provides your team with a safety net as people can understand cloud costs upfront, and discuss them as
    part of your workflow.
+   ![CI/CD](.github/images/cicd-integration.png)
+
+
+## FAQs
+
+### How can I supply input variables to Infracost Intellij extension?
+
+To supply input variables for your Terraform projects, we recommend you add a [config file](https://www.infracost.io/docs/features/config_file/). Config files allow you to add any number of variable files for defined projects. Infracost also auto-detects any var files called `terraform.tfvars`, or `*.auto.tfvars` at the root level of your Terraform projects. e.g:
+
+```yaml
+version: 0.1
+projects:
+  - path: dev
+    name: development
+    usage_file: dev/infracost-usage.yml
+    terraform_var_files:
+      - dev.tfvars
+      - global.tfvars
+```
+
+Both HCL and JSON var files are supported, JSON var files must include a `.json` suffix.
+
+### How do I supply a usage file to the Infracost Intellij extension?
+
+To supply input variables for your Terraform projects, we recommend you add a [config file](https://www.infracost.io/docs/features/config_file/). Config files allow you to define a usage file for each project you specify, e.g:
+
+```yaml
+version: 0.1
+projects:
+  - path: dev
+    usage_file: dev/infracost-usage.yml
+  - path: prod
+    usage_file: prod/infracost-usage.yml
+```
+
+### I see a lot of resources showing $0.00 costs, why is this?
+
+These resources are likely usage-based resources. For example, AWS Lambda is billed per request, so unless you specify the number of requests that the function receives. You're likely to see a message similar to the following: " Cost depends on usage: $0.20 per 1M requests" in the resource breakdown.
+
+To specify usage for resources, add a [usage file](https://www.infracost.io/docs/features/usage_based_resources/#specify-usage-manually) and reference it in a [config file](https://www.infracost.io/docs/features/config_file/) you add at the root of your workspace.
+
+### How can I configure the currency Infracost uses?
+
+If you have the `infracost` CLI installed, you can set the currency by running `infracost configure set currency EUR` (check `infracost configure --help` for other configuration options). Otherwise, update the global infracost configuration file (found at `~/.config/infracost/configuration.yml`) with the following:
+
+```yaml
+version: "0.1"
+currency: EUR
+```
+
+Infracost supports all ISO 4217 currency codes. [This FAQ](https://www.infracost.io/docs/faq/#can-i-show-costs-in-a-different-currency) has more details.