docs: docs created

README.md

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+# Doppler Go SDK
+
+To start using this SDK, just:
+
+## 1. Install the package
+
+```bash
+go get github.com/videsk/doppler-go-sdk
+```
+
+## 2. Import the package
+
+Using the method `GetSecrets` you will retrieve all secrets in once.
+
+```go
+package main
+
+import (
+	"log"
+
+	"github.com/videsk/doppler-go-sdk"
+)
+
+func main() {
+
+	dopplerClient, err := doppler.NewDoppler("projectName", "secretKey", "environment")
+    if err != nil {
+        log.Fatalf("Error with Doppler instance: %v", err)
+    }
+
+    dopplerClient.SetHTTPClient(http.DefaultClient)
+
+    secrets, err := dopplerClient.GetSecrets()
+    if err != nil {
+        log.Fatalf("Error getting the secrets: %v", err)
+    }
+
+    for key, value := range secrets {
+        log.Printf("Error getting: %s, Value: %s\n", key, value)
+    }
+
+	// The rest of the code ...
+}
+```
+
+## 3. Get specific secret by name
+
+Using the method `GetOne` you will retrieve one secret in once, but calling `getSecrets`. Which is not efficient if you need get more than one at the same time.
+
+```go
+package main
+
+import (
+	"log"
+
+	"github.com/videsk/doppler-go-sdk"
+)
+
+func main() {
+
+	dopplerClient, err := doppler.NewDoppler("projectName", "secretKey", "environment")
+    if err != nil {
+        log.Fatalf("Error with Doppler instance: %v", err)
+    }
+
+    dopplerClient.SetHTTPClient(http.DefaultClient)
+
+	secretName := "my_secret_name"
+    secretValue, err := dopplerClient.GetOne(secretName)
+    if err != nil {
+        log.Fatalf("Error getting the secret %s: %v", secretName, err)
+    }
+
+    log.Printf("The secret value is '%s': %s\n", secretName, secretValue)
+
+	// The rest of the code ...
+}
+```
+## Efficient single value
+
+In case you want retrieve multiples values you can just:
+
+```go
+secrets, err := dopplerClient.GetSecrets()
+
+if err != nil {
+    log.Fatalf("Error getting the secrets: %v", err)
+}
+
+mySecret1 := secrets["my_secret_name"]
+mySecret2 := secrets["my_super_secret"]
+```