Added IBFT 1.0 (#1081)

Signed-off-by: Adrian Sutton <adrian.sutton@consensys.net>

docs/Consensus-Protocols/IBFT.md

@@ -51,7 +51,7 @@ Properties that have specific values in IBFT 2.0 genesis files are:
 * `difficulty` - `0x1`
 * `mixHash` - `0x63746963616c2062797a616e74696e65206661756c7420746f6c6572616e6365` for Istanbul block identification.
 
-To start a node on an IBFT 2.0 private network, use the [`--genesis-file`](../Reference/Pantheon-CLI-Syntax.md#genesis-file`) option to specify the custom genesis file. 
+To start a node on an IBFT 2.0 private network, use the [`--genesis-file`](../Reference/Pantheon-CLI-Syntax.md#genesis-file) option to specify the custom genesis file. 
 
 !!!note
     The [`--genesis-file`](../Reference/Pantheon-CLI-Syntax.md#genesis-file) option is not used when running 

docs/Consensus-Protocols/Overview-Consensus.md

@@ -11,7 +11,9 @@ Pantheon implements a number of consensus protocols:
   
 * [IBFT 2.0](IBFT.md) (Proof of Authority) 
 
-The genesis file specifies the consensus protocol for a chain `config`: 
+* [Quorum IBFT 1.0](QuorumIBFT.md) (Proof of Authority) 
+
+The genesis file specifies the consensus protocol for a chain in the `config` property: 
 
 ```json tab="Ethash"
 {
@@ -47,4 +49,17 @@ The genesis file specifies the consensus protocol for a chain `config`:
   },
   ...
 }
-``` 
+``` 
+
+```json tab="IBFT 1.0" 
+{
+  "config": {
+    ....
+    "ibft": {
+      ...     
+   }
+  },
+  ...
+}
+```
+

docs/Consensus-Protocols/QuorumIBFT.md

@@ -0,0 +1,23 @@
+description: Pantheon consensus protocols
+<!--- END of page meta data -->
+
+# IBFT 1.0 
+
+Pantheon nodes can participate (submit transactions and receive blocks) in a Quorum [IBFT 1.0](https://github.com/ethereum/EIPs/issues/650) 
+network but cannot be a validator. 
+
+To connect to a Quorum IBFT 1.0 network:
+
+1. In the Quorum IBFT 1.0 genesis file, update the consensus protocol specified in the `config` property
+from `istanbul` to `ibft`:
+
+    ```json
+        "config": {
+         ...
+         "ibft": {
+         ...
+        }
+    ```
+
+1. Use the [`--genesis-file`](../Reference/Pantheon-CLI-Syntax.md#genesis-file) option to specify the 
+IBFT 1.0 genesis file.

mkdocs.yml

@@ -61,6 +61,7 @@ nav:
         - Comparing PoA Consensus Protocols: Consensus-Protocols/Comparing-PoA.md
         - Clique: Consensus-Protocols/Clique.md
         - IBFT 2.0: Consensus-Protocols/IBFT.md
+        - Quorum IBFT 1.0: Consensus-Protocols/QuorumIBFT.md
     - JSON-RPC API:
         - Overview: JSON-RPC-API/JSON-RPC-API.md
         - Using the JSON-RPC API: JSON-RPC-API/Using-JSON-RPC-API.md