feat: add custom help message and fix clap help conflict

Disable clap's built-in help flag and reroute `-h`/`--help` to
print an embedded help text from `help.txt`. Use `try_parse` to
avoid clap's default exit on parse failure, allowing custom error
output.

1 files changed, 1 insertions, 5 deletions

diff --git a/README.md b/README.md
index 0ac230d..394622d 100644
--- a/README.md
+++ b/README.md
@@ -7,11 +7,7 @@ This is a CLI program that reads your microphone device and outputs information
 # Usage
 
 ```
-dmvop --output=stdout --fmt="%{vol},%{word},%{confidence}" --device="/dev/mymic"
-      --output=stderr --fmt-file="./fmt.txt"
-      --output=ipc
-      --output=tcp
-      --output=udp
+dmvop --help
 ```
 
 # License