Switch to OAPI for codegen (#5)

* testing oapi codegen + updated spec

* try oapi codegen

* working generator

* working client build with oapi

Author: mattoni

README.md

@@ -1,20 +1,66 @@
 # Cycle API Go Client
 
-_This is an auto-generated API client based on the [OpenAPI Spec for Cycle](https://github.com/cycleplatform/api-spec). Please do not open any PRs for the generated code under /client. If you have any questions on what changes are made in the latest version, please refer to the spec above._
+_This is an auto-generated API client based on the [OpenAPI Spec for Cycle](https://github.com/cycleplatform/api-spec). Please do not open any PRs for the generated code in `generated.go`. If you have any questions on what changes are made in the latest version, please refer to the spec above._
 
-## Setup
 
-Install Ogen
+## Usage
 
-`go install -v github.com/ogen-go/ogen/cmd/ogen@latest`
+`go get github.com/cycleplatform/api-client-go`
 
-## Generating
+Create a client
 
-### Updating the spec
+```go
+package main
+
+import (
+    cycle "github.com/cycleplatform/api-client-go"
+)
+
+func main() {
+    apiKey := os.Getenv("CYCLE_API_KEY")
+	if apiKey == "" {
+		log.Fatal("missing env var CYCLE_API_KEY")
+	}
+
+	hubId := os.Getenv("CYCLE_HUB_ID")
+	if hubId == "" {
+		log.Fatal("missing env var CYCLE_HUB_ID")
+	}
+
+	c, err := cycle.NewAuthenticatedClient(cycle.ClientConfig{
+		APIKey: apiKey,
+		HubID:  hubId,
+	})
+
+	if err != nil {
+		log.Fatal(err)
+	}
+
+    // Get list of environments
+    resp, err := c.GetEnvironmentsWithResponse(context.TODO(), &cycle.GetEnvironmentsParams{})
+    if err != nil {
+        log.Fatal(err)
+    }
+
+    if resp.StatusCode() != http.StatusOK {
+        log.Fatalf("Expected HTTP 200 but received %d %s", resp.StatusCode(), *resp.JSONDefault.Error.Title)
+    }
+
+    for _, v := range resp.JSON200.Data {
+        fmt.Printf("ID: %s - Name: %s\n", v.Id, v.Name)
+    }
+}
+```
+
+## Development
+
+### Updating the API spec
+
+Update the API spec to the latest version:
 
 `git submodule update --recursive --remote`
 
-Using `npm`, run `(cd api-spec; npm run build:public && npm run build:internal)`
+Using `npm`, run `(cd api-spec; npm run build:platform && npm run downconvert:platform)`
 
 ### Generating the client