Add openssl to tools chapter

src/SUMMARY.md

@@ -14,3 +14,4 @@
     - [Tools](./ops/tools/main.md)
         - [Ansible](./ops/tools/ansible.md)
         - [MongoDB](./ops/tools/mongodb.md)
+        - [OpenSSL](./ops/tools/openssl.md)

src/ops/tools/openssl.md

@@ -0,0 +1,15 @@
+# OpenSSL
+
+## Checking
+
+### CSR
+
+    openssl req -text -noout -verify -in request.csr
+
+### Key
+
+    openssl rsa -in privkey.key -check
+
+### Cert
+
+    openssl x509 -in certficate.crt -text -noout