fixup! Add first cut of git-credential-fdoss

Simplify wording of formatSecretVal doc string. Add link to secret
encoding in git-credential-libsecret.

Addresses: #3 (comment)

main.go

@@ -228,10 +228,9 @@ func makeAttrs(gc *GitCredential) map[string]string {
 // formatSecretVal encodes the secret and/or variable parts of a GitCredential
 // into a string suitable for storing with the secret service. Variable parts,
 // such as the password expiry time, cannot be encoded as an attribute as they
-// need to match when looking up and such variable parts cannot be used for
-// that.
+// need to match on lookup.
 //
-// The format for encoding multiple values is the same as used by
+// The format for [encoding] multiple values is the same as used by
 // git-credential-libsecret so as to be compatible with it.
 //
 // Note: This format is not compatible with the unencrypted keyring format of
@@ -242,6 +241,8 @@ func makeAttrs(gc *GitCredential) map[string]string {
 // as if you are going to store your passwords in plain text, you may as well
 // use git-credential-store. However, one may want all their credentials
 // together in one place stored in plain text for easier exploitation.
+//
+// [encoding]: https://github.com/git/git/blob/159f2d50e75c17382c9f4eb7cbda671a6fa612d1/contrib/credential/libsecret/git-credential-libsecret.c#L212
 func formatSecretVal(gc *GitCredential) string {
 	secret := gc.Password
 	if gc.PasswordExpiryUTC != "" {