Create how-to-generate-self-signed-document-signing-certificate.md

docs/docs/self-host/guides/how-to-generate-self-signed-document-signing-certificate.md

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+---
+title: How to generate self-signed document signing certificate?
+---
+# Steps to generate self-signed document singing certificate for testing OpenSign
+```
+# execute below command and use passphrase 'opensign'
+openssl genrsa -des3 -out ./local_dev.key 2048
+openssl req -key ./local_dev.key -new -x509 -days 365 -out ./local_dev.crt
+openssl pkcs12 -inkey ./local_dev.key -in ./local_dev.crt -export -out ./local_dev.pfx
+openssl base64 -in ./local_dev.pfx -out ./base64_pfx
+```