all: add command to set private key

The set-private-key command encrypt the issuer's value (hash:secret...)
in the file using private key.
The supported private key is RSA.

1 files changed, 5 insertions, 0 deletions

diff --git a/README.md b/README.md
index 1d5de60..6c977bc 100644
--- a/README.md
+++ b/README.md
@@ -47,6 +47,11 @@ remove <LABEL>
 rename <LABEL> <NEW-LABEL>
 
 	Rename a LABEL into NEW-LABEL.
+
+set-private-key <PRIVATE-KEY-FILE>
+
+    Encrypt the issuer's value (hash:secret...) in the file using private key.
+    The supported private key is RSA.
 ```
 
 ##  ENCRYPTION