Add blog on Provider (#78)

docs/blog/2023-11-18-provider.md

@@ -0,0 +1,20 @@
+---
+slug: provider
+title: Provider v.s. @Provider
+authors: jiaqi
+tags: [Java]
+---
+
+A **Provider** is an interface defined in [JSR 330][JSR 330 Provider]. It is part of the _general_ dependency
+injection concept in Java.
+
+Whether we are on Java SR or EE, Provider will always be loadable from classpath. For example, the [HK2] is an
+implementation of JSR-330 in a JavaSE environment and it conforms to the JSR 330 standard by loading the
+[Provider][JSR 330 Provider] in its implementations.
+
+**@Provider**, on the other hand, is a
+[_Java EE/Jakarta EE concept_](https://github.com/jakartaee/rest/blob/master/jaxrs-api/src/main/java/jakarta/ws/rs/ext/Provider.java).
+If we are developing Java EE applications, we can use both (`Provider` & `@Provider`) at the same time.
+
+[JSR 330 Provider]: https://qubitpi.github.io/javax-inject/api/javax/inject/Provider.html
+[HK2]: https://qubitpi.github.io/glassfish-hk2/