Adding message relayer scripts, reformating send message scripts (#790)

* Adding message relayer scripts, reformating send message scripts

* Addressing PR feedback

* Update README.md

Valid .

Co-authored-by: Hernando Castano <HCastano@users.noreply.github.com>

* Fixing send-message-from-rialto-millau

* Fixing send message script from millau to rialot

Co-authored-by: Hernando Castano <HCastano@users.noreply.github.com>

bridges/README.md

@@ -11,6 +11,7 @@ Substrate chains or Ethereum Proof-of-Authority chains.
 🚧 The bridges are currently under construction - a hardhat is recommended beyond this point 🚧
 
 ## Contents
+
 - [Installation](#installation)
 - [High-Level Architecture](#high-level-architecture)
 - [Project Layout](#project-layout)
@@ -19,6 +20,7 @@ Substrate chains or Ethereum Proof-of-Authority chains.
 - [Community](#community)
 
 ## Installation
+
 To get up and running you need both stable and nightly Rust. Rust nightly is used to build the Web
 Assembly (WASM) runtime for the node. You can configure the WASM support as so:
 
@@ -70,6 +72,7 @@ Take a look at [Bridge High Level Documentation](./docs/high-level-overview.md)
 description of the bridge interaction.
 
 ## Project Layout
+
 Here's an overview of how the project is laid out. The main bits are the `node`, which is the actual
 "blockchain", the `modules` which are used to build the blockchain's logic (a.k.a the runtime) and
 the `relays` which are used to pass messages between chains.
@@ -91,7 +94,7 @@ the `relays` which are used to pass messages between chains.
 ├── relays          // Application for sending headers and messages between chains
 │  └──  ...
 └── scripts         // Useful development and maintenence scripts
- ```
+```
 
 ## Running the Bridge
 
@@ -99,9 +102,9 @@ To run the Bridge you need to be able to connect the bridge relay node to the RP
 on each side of the bridge (source and target chain).
 
 There are 3 ways to run the bridge, described below:
- - building & running from source,
- - building or using Docker images for each individual component,
- - running a Docker Compose setup (recommended).
+- building & running from source,
+- building or using Docker images for each individual component,
+- running a Docker Compose setup (recommended).
 
 ### Using the Source
 
@@ -196,6 +199,7 @@ monitoring dashboards, etc. see the [Deployments README](./deployments/README.md
 
 A straightforward way to interact with and test the bridge is sending messages. This is explained
 in the [send message](./docs/send-message.md) document.
+
 ## Community
 
 Main hangout for the community is [Element](https://element.io/) (formerly Riot). Element is a chat
@@ -208,4 +212,3 @@ Element channel.
 
 The [Substrate Technical](https://app.element.io/#/room/#substrate-technical:matrix.org) Element
 channel is most suited for discussions regarding Substrate itself.
-