Add shell completion and manpage generation (#233)

Cargo.lock

@@ -258,6 +258,15 @@ dependencies = [
  "textwrap",
 ]
 
+[[package]]
+name = "clap_complete"
+version = "3.1.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "da92e6facd8d73c22745a5d3cbb59bdf8e46e3235c923e516527d8e81eec14a4"
+dependencies = [
+ "clap",
+]
+
 [[package]]
 name = "clap_derive"
 version = "3.1.18"
@@ -280,6 +289,16 @@ dependencies = [
  "os_str_bytes",
 ]
 
+[[package]]
+name = "clap_mangen"
+version = "0.1.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "121b598d1b9d63d4ff3b7dae8defd88cc23e41850ee89fd2feec2e7d992e6ec8"
+dependencies = [
+ "clap",
+ "roff",
+]
+
 [[package]]
 name = "codespan-reporting"
 version = "0.11.1"
@@ -1533,6 +1552,12 @@ dependencies = [
  "winapi",
 ]
 
+[[package]]
+name = "roff"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b833d8d034ea094b1ea68aa6d5c740e0d04bad9d16568d08ba6f76823a114316"
+
 [[package]]
 name = "rust-ini"
 version = "0.18.0"
@@ -2041,6 +2066,8 @@ dependencies = [
  "cfg-if",
  "chrono",
  "clap",
+ "clap_complete",
+ "clap_mangen",
  "color-eyre",
  "console",
  "directories",