Add sample config file and instructions

providers/aws/fargate.toml

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+#
+# Example configuration file for virtual-kubelet AWS Fargate provider.
+#
+# Usage:
+# virtual-kubelet --provider aws --provider-config fargate.toml
+#
+
+# AWS region where Fargate resources are provisioned. Mandatory.
+Region = "us-east-1"
+
+# Fargate cluster name. Optional. Defaults to "default".
+# If a cluster with this name does not exist in the region, virtual-kubelet will create it.
+# Although the same Fargate cluster can be shared by multiple virtual-kubelets,
+# we recommend to create a dedicated Fargate cluster for each virtual-kubelet.
+ClusterName = "fargate1"
+
+# List of subnets that pods are connected to. Mandatory.
+Subnets = ["subnet-12345678"]
+
+# List of security groups for pods. Optional.
+# If omitted, pods inherit their VPC's default security group.
+SecurityGroups = ["sg-12345678", "sg-87654321"]
+
+# Whether pod ENIs are assigned a public IPv4 address. Optional. Defaults to false.
+AssignPublicIPv4Address = false
+
+# Fargate platform version. Optional. Defaults to "LATEST".
+# https://docs.aws.amazon.com/AmazonECS/latest/developerguide/platform_versions.html
+PlatformVersion = "LATEST"
+
+# Operating system for pods. Optional. Defaults to "Linux".
+OperatingSystem = "Linux"
+
+# Fargate capacity advertised by virtual-kubelet. Optional. Defaults to the values below.
+# Capacity is specified using Kubernetes resource format.
+# https://kubernetes.io/docs/concepts/configuration/manage-compute-resources-container/
+CPU = "20"
+Memory = "40Gi"
+Pods = "20"