Adding Microsoft adapter (#74)

* Added microsoft adapter

* Added MicrosoftConfig interface

packages/openauth/src/adapter/microsoft.ts

@@ -0,0 +1,25 @@
+import { Oauth2Adapter, Oauth2WrappedConfig } from "./oauth2.js"
+import { OidcAdapter, OidcWrappedConfig } from "./oidc.js"
+
+export interface MicrosoftConfig extends Oauth2WrappedConfig {
+  tenant: string
+}
+
+export function MicrosoftAdapter(config: MicrosoftConfig) {
+  return Oauth2Adapter({
+    ...config,
+    type: "microsoft",
+    endpoint: {
+      authorization: `https://login.microsoftonline.com/${config?.tenant}/oauth2/v2.0/authorize`,
+      token: `https://login.microsoftonline.com/${config?.tenant}/oauth2/v2.0/token`,
+    },
+  })
+}
+
+export function MicrosoftOidcAdapter(config: OidcWrappedConfig) {
+  return OidcAdapter({
+    ...config,
+    type: "microsoft",
+    issuer: "https://graph.microsoft.com/oidc/userinfo",
+  })
+}