docs: update common issues with sample code

Author: JCMais

COMMON_ISSUES.md

@@ -1,7 +1,46 @@
 ## Error: SSL peer certificate or SSH remote key was not Ok
 
-You need to set either [`CAINFO`](https://curl.haxx.se/libcurl/c/CURLOPT_CAINFO.html) or [`CAPATH`](https://curl.haxx.se/libcurl/c/CURLOPT_CAPATH.html) options, or disable SSL verification with [`SSL_VERIFYPEER`](https://curl.haxx.se/libcurl/c/CURLOPT_SSL_VERIFYPEER.html) which is not recommended.
+You need to set either [`CAINFO`](https://curl.haxx.se/libcurl/c/CURLOPT_CAINFO.html) or [`CAPATH`](https://curl.haxx.se/libcurl/c/CURLOPT_CAPATH.html) options, or disable SSL verification with [`SSL_VERIFYPEER`](https://curl.haxx.se/libcurl/c/CURLOPT_SSL_VERIFYPEER.html) (not recommended).
 
 The certificate file can be obtained in multiple ways:
-1. Downloaded from https://curl.haxx.se/docs/caextract.html
-2. Creating a file with the contents of `tls.rootCertificates`, which was added with Node.js `v12.3.0`
+
+1. Extracted directly from your system/browser
+2. Downloaded from https://curl.haxx.se/docs/caextract.html, which is based on the one from Firefox
+3. Creating a file with the contents of `tls.rootCertificates`, which was added with Node.js `v12.3.0`, example:
+```javascript
+const fs = require('fs')
+const path = require('path')
+const tls = require('tls')
+
+const { curly } = require('node-libcurl')
+
+// important steps
+const certFilePath = path.join(__dirname, 'cert.pem')
+const tlsData = tls.rootCertificates.join('\n')
+fs.writeFileSync(certFilePath, tlsData)
+
+async function run() {
+  return curly.post('https://httpbin.org/anything', {
+    postFields: JSON.stringify({ a: 'b' }),
+    httpHeader: ['Content-type: application/json'],
+    caInfo: certFilePath,
+    verbose: true,
+  })
+}
+
+run()
+  .then(({ data, statusCode, headers }) =>
+    console.log(
+      require('util').inspect(
+        {
+          data: JSON.parse(data),
+          statusCode,
+          headers,
+        },
+        null,
+        4,
+      ),
+    ),
+  )
+  .catch((error) => console.error(`Something went wrong`, { error }))
+```

README.md

@@ -41,9 +41,9 @@
     - [Setting HTTP headers](#setting-http-headers)
   - [Form Submission (Content-Type: application/x-www-form-urlencoded)](#form-submission-content-type-applicationx-www-form-urlencoded)
   - [MultiPart Upload / HttpPost libcurl Option (Content-Type: multipart/form-data)](#multipart-upload--httppost-libcurl-option-content-type-multipartform-data)
-- [Benchmarks](#benchmarks)
 - [API](#api)
 - [Common Issues](#common-issues)
+- [Benchmarks](#benchmarks)
 - [Supported Libcurl Versions](#supported-libcurl-versions)
 - [For Enterprise](#for-enterprise)
 - [Detailed Installation](#detailed-installation)
@@ -161,9 +161,6 @@ curl.on('error', close);
 
 For more examples check the [examples folder](./examples).
 
-## Benchmarks
-Go [here](./benchmark)
-
 ## API
 
 The code provides Typescript type definitions, which should document most of the API.
@@ -176,6 +173,9 @@ For more usage examples check the [examples folder](./examples).
 
 See [COMMON_ISSUES.md](./COMMON_ISSUES.md)
 
+## Benchmarks
+Go [here](./benchmark)
+
 ## Supported Libcurl Versions
 
 The addon is only tested against libcurl version `7.50.0` and the latest one available.
@@ -286,12 +286,12 @@ where `--target` is the current version of NW.js you are using
 
 > yarn
 ```bash
-npm_config_runtime=electron npm_config_target=$(yarn --silent electron --version) npm_config_disturl=https://atom.io/download/atom-shell yarn add node-libcurl
+npm_config_runtime=electron npm_config_target=$(yarn --silent electron --version) npm_config_disturl=https://www.electronjs.org/headers yarn add node-libcurl
 ```
 
 > npm
 ```bash
-npm install node-libcurl --runtime=electron --target=$(yarn --silent electron --version) --disturl=https://atom.io/download/atom-shell --save
+npm install node-libcurl --runtime=electron --target=$(yarn --silent electron --version) --disturl=https://www.electronjs.org/headers --save
 ```
 
 Where `--target` is the version of electron you are using, in our case, we are just using the version returned by the locally installed `electron` binary.