manual added documentation in collection manual

collections/manual/documentation/dashboard/tfgrid/grid_status.md

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+# Grid Status
+
+Check the status and health of ThreeFold services From [Grid Status](https://status.grid.tf/status/threefold)
+
+![](../img/grid_health.png)

collections/manual/documentation/dashboard/tfgrid/node_monitoring.md

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+# Node Monitoring
+
+Monitor and check the metrics and status of Zero-OS nodes from [Node Monitoring](https://metrics.grid.tf/d/rYdddlPWkfqwf/zos-host-metrics?orgId=2&refresh=30s)
+
+![](../img/Monitoring.png)

collections/manual/documentation/dashboard/tfgrid/node_statistics.md

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+# Statistics
+
+Statistics allows you to see the distribution of 3Nodes all over the world with information on how many nodes are available and in which country.
+
+![](../img/statistics.png)
+
+Here you can see generic overview about:
+
+- Number of Nodes
+- Number of Dedicated Nodes
+- Number of Farms
+- Number of Countries 
+- The capacity CRU, SRU, HRU, MRU
+- Number of GPUs
+- Number of Gateways
+- Number of Twins
+- The number of public IPs available
+- Number of Contracts

collections/manual/documentation/dashboard/tfgrid/tfgrid.md

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+# TFGrid
+
+Check and use all things related to the threefold grid. Including:
+
+- The status of ThreeFold services from the [Grid Status](./grid_status.md) website.
+- The statistics of all nodes that are available on the ThreeFold grid from [Node Statistics](./node_statistics.md).
+- The health and status of Zero-OS nodes that are available on the ThreeFold grid from [Node Monitoring](./node_monitoring.md).
+
+   ![](../img/sidebar_1.png)
+
+***
+
+## Table of Content
+
+- [Grid Status](./grid_status.md)
+- [Node Statistics](./node_statistics.md)
+- [Node Monitoring](./node_monitoring.md)