introduce CERTIFICATES, guide to find root certificate

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diff --git a/CERTIFICATES.d/04-certificate.avif b/CERTIFICATES.d/04-certificate.avif
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+Certificate name from browser
+=============================
+
+[![GitHub stars](https://img.shields.io/github/stars/eworm-de/routeros-scripts?logo=GitHub&style=flat&color=red)](https://github.com/eworm-de/routeros-scripts/stargazers)
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+
+[⬅️ Go back to main README](README.md)
+
+All well known desktop, mobile and server operating systems come with a
+certificate store that is populated with a set of well known and trusted
+certificates, acting as *trust anchors*.
+
+However RouterOS does not, still sometimes a specific certificate is
+required to properly verify a chain of trust. One example is downloading
+the scripts from this repository with `fetch` command, thus the very
+first step of [installation](README.md#the-long-way-in-detail) is importing
+the certificate.
+
+The scripts can install additional certificates when required. This happens
+from this repository if available, or from [mkcert.org](https://mkcert.org)
+as a fallback.
+
+Get the certificate's CommonName
+--------------------------------
+
+But how to determine what certificate may be required? Often easiest way
+is to use a desktop browser to get that information. This demonstration uses
+[Mozilla Firefox](https://www.mozilla.org/firefox/).
+
+Let's assume we want to make sure the certificate for
+[git.eworm.de](https://git.eworm.de/) is available. Open that page in the
+browser, then click the *lock* icon in addressbar, followed by "*Connection
+secure*".
+
+![screenshot: dialog A](CERTIFICATES.d/01-dialog-A.avif)
+
+The dialog will change, click "*More information*".
+
+![screenshot: dialog B](CERTIFICATES.d/02-dialog-B.avif)
+
+A new window opens, click the button "*View Certificate*". (That window
+can be closed now.)
+
+![screenshot: window](CERTIFICATES.d/03-window.avif)
+
+A new tab opens, showing information on the server certificate and its
+chain of trust. The leftmost certificate is what we are interested in.
+
+![screenshot: certificate](CERTIFICATES.d/04-certificate.avif)
+
+Now we know that "`ISRG Root X2`" is required, some scripts need just
+that information.
+
+Import a certificate by CommonName
+----------------------------------
+
+Running the function `$CertificateAvailable` with that name as parameter
+makes sure the certificate is available in the device's store:
+
+    $CertificateAvailable "ISRG Root X2";
+
+If the certificate is actually available already nothing happens, and there
+is no output. Otherwise the certificate is downloaded and imported.
+
+If importing a certificate with that exact name fails a warning is given
+and nothing is actually imported.
+
+---
+[⬅️ Go back to main README](README.md)  
+[⬆️ Go back to top](#top)