Data export tool doc (#13419)

* data export tool docs

* change doc gif path

erpnext/docs/user/manual/en/setting-up/data/data-export-tool.md

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+# Data Export Tool
+
+Use this tool to export data in Excel or CSV format
+
+To open the Data Export Tool, you can either go to Setup > Data Export OR simply type `Data Export` in Global Search.
+
+<img alt="Data Export" class="screenshot" src="{{docs_base_url}}/assets/img/setup/data-export/data-export-tool.gif">
+
+### Options
+
+1. Select Doctype
+
+    You will be provided with the list of document types which you can export. Scroll through the list or type the name of the Doctype you want to export.
+
+2. File Type
+
+    Select File format of the data to be exported (Excel or CSV).
+
+3. Add Filter (optional)
+
+    Add filters to export only required data.
+    This filter is similar to the filter in list view.
+
+    eg. If you want the data of project related to specific company, you can use the filter to select the company.
+
+4. Field Multicheck (optional)
+
+    Only checked fields will be exported.
+
+**Note:**
+
+    If you do not want a child table to be exported simply deselect all the fields of that child table.