Create getsimple-cms-detector.yaml

Test 
```
nuclei -t getsimple-cms-detector.yaml -u http://www.lrc.ic.unicamp.br/~luisrussi
nuclei -t getsimple-cms-detector.yaml -u https://hebergement-pro.com/
```

technologies/getsimple-cms-detector.yaml

@@ -0,0 +1,20 @@
+info:
+  name: GetSimple CMS Detector
+  author: philippedelteil
+  severity: info
+  description: With this template we can detect a running GetSimple CMS instance
+  tags: getsimple
+requests:
+  - method: GET
+    path:
+      - "{{BaseURL}}/readme.txt"
+    matchers-condition: and
+    matchers:
+      - type: word
+        part: body
+        words:
+          - 'GetSimple CMS is a flatfile CMS'
+      - type: status
+        part: header
+        status:
+          - 200