sekrets decrypt -a without username matches all account that contains (#22)

* decrypt -a  without username matches all account that contains

Author: ishtiaque05

docs/USAGE.md

@@ -6,15 +6,15 @@ Sekrets provides a command-line interface (CLI) to securely encrypt files and st
 ## Encrypt a File
 To encrypt a file:
 ```sh
-sekret encrypt -f secret.txt
+sekrets encrypt -f secret.txt
 ```
 - The encrypted file is stored as sekrets.enc in the appropriate directory.
 - You will be prompted to enter a password for encryption.
 
 ## Decrypt Credentials
 
 ```sh
-sekret decrypt -a github
+sekrets decrypt -a github
 ```
 
 - You must enter the same password used for encryption
@@ -24,7 +24,7 @@ sekret decrypt -a github
 
 To add new credentials to the encrypted file:
 ```sh
-sekret append -a github -u myusername -p mypassword
+sekrets append -a github -u myusername -p mypassword
 ```
 
 - This securely appends new credentials to the existing encrypted file.

src/secrets/credential_manager.rs

@@ -52,7 +52,7 @@ impl CredentialManager {
             .credentials
             .iter()
             .filter_map(|((acct, _), credential)| {
-                if acct == &account {
+                if acct.to_lowercase().contains(&account.to_lowercase()) {
                     Some(credential.clone())
                 } else {
                     None