git-secret: add page (#6589)

pages/common/git-secret.md

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+# git secret
+
+> Bash tool which stores private data inside a Git repository.
+> More information: <https://github.com/sobolevn/git-secret>.
+
+- Initialize `git-secret` in a local repository:
+
+`git secret init`
+
+- Grant access to the current Git user's email:
+
+`git secret tell -m`
+
+- Grant access by email:
+
+`git secret tell {{email}}`
+
+- Revoke access by email:
+
+`git secret killperson {{email}}`
+
+- List emails with access to secrets:
+
+`git secret whoknows`
+
+- Register a secret file:
+
+`git secret add {{path/to/file}}`
+
+- Encrypt secrets:
+
+`git secret hide`
+
+- Decrypt secret files:
+
+`git secret reveal`