add a wechat official account (#9)

diff --git a/_community/zh/community.md b/_community/zh/community.md
index 5e10f4a..30466b5 100755
--- a/_community/zh/community.md
+++ b/_community/zh/community.md
@@ -23,6 +23,12 @@
 
       欢迎关注以及留言
 
+  - title: Apache Pegasus 微信公众号
+    description: >
+      关注我们的微信公众号 Apache Pegasus,了解更多技术内幕,并加入微信用户群
+    picture: /assets/images/wechat.jpeg
+
+
 contributor_items:
   - title: Pull Requests
     description: >
diff --git a/_docs/zh/administration/hotspot-detection.md b/_docs/zh/administration/hotspot-detection.md
index 0eeb0aa..9e030a3 100644
--- a/_docs/zh/administration/hotspot-detection.md
+++ b/_docs/zh/administration/hotspot-detection.md
@@ -83,4 +83,6 @@
 hotkey_buckets_num = 37
 # 一次探测最长时间
 max_seconds_to_detect_hotkey = 150
+# 单次探测收集时间周期
+hotkey_analyse_time_interval_s = 10
 ```
diff --git a/_layouts/community.html b/_layouts/community.html
index 99b4419..c424a08 100644
--- a/_layouts/community.html
+++ b/_layouts/community.html
@@ -25,6 +25,11 @@
                 <div class="columns is-multiline is-centered">
                     {% for item in page.contact_items %}
                     <div class="column is-4 has-text-centered">
+                        {% if item.picture %}
+                        <div class="picture">
+                            <img src={{ item.picture }} height="135" width="135"  />
+                        </div>
+                        {% endif %}
                         {% if item.icon %}
                         <div class="contributor-item-icon icon is-large">
                             <i class="{{ item.icon }} fa-4x"></i>
diff --git a/assets/images/wechat.jpeg b/assets/images/wechat.jpeg
new file mode 100644
index 0000000..564208f
--- /dev/null
+++ b/assets/images/wechat.jpeg
Binary files differ