Add Codex networks information (#6)

* Fix link to Networks page

* Add brief networks information

* Mention Bootstrap nodes

index.md

@@ -24,7 +24,7 @@ features:
     icon: 📚
   - title: Networks
     details: Participate in Codex network as a Storage operator or Buyer
-    link: /networks
+    link: /networks/networks
     icon: 🚦
   - title: Developers
     details: Build and Codex and

networks/networks.md

@@ -1,5 +1,19 @@
 # Codex networks
 
- Work in progress :construction:
+ At Codex, we are launching several networks which are used for different purposes
+ | Network            | Status                  | Blockchain                                                              | Purpose                                                                 |
+ | ------------------ | ----------------------- | ----------------------------------------------------------------------- | ----------------------------------------------------------------------- |
+ | Devnet             | :building_construction: | [Geth PoA](https://geth.ethereum.org/docs/fundamentals/private-network) | Dedicated for development purposes and following latest `master` builds |
+ | [Testnet](testnet) | :white_check_mark:      | [Geth PoA](https://geth.ethereum.org/docs/fundamentals/private-network) | A public network for testing purposes, following latest releases        |
+ | Mainnet            | :construction:          | :construction:                                                          | A main public network                                                   |
 
- Codex networks overview
+ The main difference between networks are following
+ - Network purpose
+ - Bootstrap nodes
+ - Number of storage nodes
+ - Available storage volume
+ - Blockchain network
+ - Marketplace contract version
+ - Circuit files set used for proof verification
+
+ The easiest way to start to use Codex is to [Join Testnet](testnet).