add sekeleton for admin functions

jams-server/src/main/java/net/jami/jams/server/servlets/api/admin/devices/DeviceServlet.java

+package net.jami.jams.server.servlets.api.admin.devices;
+
+import jakarta.servlet.ServletException;
+import jakarta.servlet.annotation.WebServlet;
+import jakarta.servlet.http.HttpServlet;
+import jakarta.servlet.http.HttpServletRequest;
+import jakarta.servlet.http.HttpServletResponse;
+
+import java.io.IOException;
+
+@WebServlet("/api/admin/device/*")
+public class DeviceServlet extends HttpServlet {
+
+    //Get a detailed device info.
+    @Override
+    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+        super.doGet(req, resp);
+    }
+
+    //Update device data.
+    @Override
+    protected void doPut(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+        super.doPut(req, resp);
+    }
+
+    //Revoke/delete a device.
+    @Override
+    protected void doDelete(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+        super.doDelete(req, resp);
+    }
+}

jams-server/src/main/java/net/jami/jams/server/servlets/api/admin/devices/DevicesServlet.java

+package net.jami.jams.server.servlets.api.admin.devices;
+
+import jakarta.servlet.ServletException;
+import jakarta.servlet.annotation.WebServlet;
+import jakarta.servlet.http.HttpServlet;
+import jakarta.servlet.http.HttpServletRequest;
+import jakarta.servlet.http.HttpServletResponse;
+
+import java.io.IOException;
+
+@WebServlet("/api/admin/devices/*")
+public class DevicesServlet extends HttpServlet {
+
+    //Get a list of devices for a user.
+    @Override
+    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+        super.doGet(req, resp);
+    }
+}

jams-server/src/main/java/net/jami/jams/server/servlets/api/admin/users/UserServlet.java

+package net.jami.jams.server.servlets.api.admin.users;
+
+import jakarta.servlet.ServletException;
+import jakarta.servlet.annotation.WebServlet;
+import jakarta.servlet.http.HttpServlet;
+import jakarta.servlet.http.HttpServletRequest;
+import jakarta.servlet.http.HttpServletResponse;
+
+import java.io.IOException;
+
+@WebServlet("/api/admin/user/*")
+public class UserServlet extends HttpServlet {
+
+    //Get the user profile.
+    @Override
+    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+        super.doGet(req, resp);
+    }
+
+    //Create an internal user - this is always technically available, because internal users have the right to exist.
+    @Override
+    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+        super.doPost(req, resp);
+    }
+
+    //Update user data.
+    @Override
+    protected void doPut(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+        super.doPut(req, resp);
+    }
+
+    //Revoke a user.
+    @Override
+    protected void doDelete(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+        super.doDelete(req, resp);
+    }
+}

jams-server/src/main/java/net/jami/jams/server/servlets/api/admin/users/UsersServlet.java

+package net.jami.jams.server.servlets.api.admin.users;
+
+import jakarta.servlet.ServletException;
+import jakarta.servlet.annotation.WebServlet;
+import jakarta.servlet.http.HttpServlet;
+import jakarta.servlet.http.HttpServletRequest;
+import jakarta.servlet.http.HttpServletResponse;
+
+import java.io.IOException;
+
+@WebServlet("/api/admin/users")
+public class UsersServlet extends HttpServlet {
+
+    //Returns a list of users.
+    @Override
+    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+        super.doGet(req, resp);
+    }
+}