update README

Author: charleswli

README.md

@@ -1 +1,73 @@
 # plaid-go
+
+plaid-go is a Go client implementation of the [Plaid API](https://plaid.com/docs).
+
+Install via `go get github.com/plaid/plaid-go`.
+
+TODO:
+- Complete README
+- Complete testing
+- Add CI
+
+
+## Examples
+
+### Adding an Auth user
+
+```go
+client := plaid.NewClient("test_id", "test_secret", plaid.Tartan)
+
+// POST /auth
+postRes, mfaRes, err := client.AuthAddUser("plaid_test", "plaid_good", "", "bofa", nil)
+if err != nil {
+    fmt.Println(err)
+} else if mfaRes != nil {
+    // Need to switch on different MFA types. See https://plaid.com/docs/#mfa-auth.
+    switch mfaRes.Type {
+    case "device":
+        fmt.Println("--Device MFA--")
+        fmt.Println("Message:", mfaRes.Device.Message)
+    case "list":
+        fmt.Println("--List MFA--")
+        fmt.Println("Mask:", mfaRes.List[0].Mask, "\nType:", mfaRes.List[0].Type)
+    case "questions":
+        fmt.Println("--Questions MFA--")
+        fmt.Println("Question:", mfaRes.Questions[0].Question)
+    case "selections":
+        fmt.Println("--Selections MFA--")
+        fmt.Println("Question:", mfaRes.Selections[1].Question)
+        fmt.Println("Answers:", mfaRes.Selections[1].Answers)
+    }
+
+    postRes2, mfaRes2, err := client.AuthStepSendMethod(mfaRes.AccessToken, "type", "email")
+    if err != nil {
+        fmt.Println("Error submitting send_method", err)
+    }
+    fmt.Println(mfaRes2, postRes2)
+
+    postRes2, mfaRes2, err = client.AuthStep(mfaRes.AccessToken, "tomato")
+    if err != nil {
+        fmt.Println("Error submitting mfa", err)
+    } else {
+        fmt.Println(mfaRes2, postRes2)
+    }
+} else {
+    fmt.Println(postRes.Accounts)
+    fmt.Println("Auth Get")
+    fmt.Println(client.AuthGet("test_bofa"))
+
+    fmt.Println("Auth DELETE")
+    fmt.Println(client.AuthDelete("test_bofa"))
+}
+```
+
+### Querying a category
+```go
+// GET /categories/13001001
+category, err := plaid.GetCategory(plaid.Tartan, "13001001")
+if err != nil {
+    fmt.Println(err)
+} else {
+    fmt.Println("category", category.ID, "is", strings.Join(category.Hierarchy, ", "))
+}
+```