docs: add dosc about project tehcnologies and how to runt the server

CONTRIBUTING.md

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+# Contributing to Samourai Wallet
+
+## Technologies and scope
+
+- Dependencies path: [package.json](https://github.com/Samourai-Wallet/samourai-dojo/blob/develop/package.json).
+- [Node.js](https://nodejs.org/en/download): cross-platform, open-source JavaScript runtime environment.
+- [Mocha](https://mochajs.org/): automated tests and code coverage.
+- Developer's documentation path: [doc/guides/](https://github.com/Samourai-Wallet/samourai-dojo/tree/develop/doc/guides/).
+- Arquitecture: 
+- Database:

doc/guides/HowToRun.md

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+# How to run
+
+First, verify the compatible node version in package.json and install node.js.
+
+Now, install project dependencies: 
+```
+npm install
+```
+
+create a index.js file in path: keys/
+
+Add in file code the mainet or testnet parameters.
+You can find mainet and testnet parameters in keys/index-example.js.
+
+```
+export default {
+    // Mainnet parameters
+    bitcoin: {
+        // Mainet settings
+    }
+}
+```