advotracker_client: introduce Windows icon handling

* include `windres` crate
* create a `build.rs`
* include a `hotline.svg` that is converted to advotracker.ico
  using inkscape and imagemagick
* crate a `README.md`

Signed-off-by: Ralf Zerres <ralf.zerres@networkx.de>

crates/advotracker_client/Cargo.toml

@@ -7,11 +7,17 @@ readme = "README.md"
 license = "(0BSD OR MIT)"
 edition = "2018"
 default-run = "advotracker"
+build = "build.rs"
 
 [target.'cfg(windows)'.dependencies]
-winapi = { version = "0.3", features = ["winuser"] }
+winapi = { version = "0.3", features = [ "winuser" ] }
 #diesel = { version = "1.4", features = [ "postgres", "sqlite" ] }
 
+[target.'cfg(target_os = "windows")'.build-dependencies]
+winres = { version = "0.1" }
+# for language constants
+winapi = { version = "0.3", features = [ "winnt" ] }
+
 [dependencies]
 async-stream = "~0.2"
 chrono = { version = "~0.4.0", features = ["serde"] }
@@ -37,6 +43,9 @@ tracing = { version = "~0.1" }
 tracing-subscriber = { version = "~0.2.0", features = ["tracing-log"] }
 viperus =  { git = "https://github.com/maurocordioli/viperus", features = ["cache", "fmt-clap", "fmt-env", "global", "watch"] }
 
+[build-dependencies]
+winres = { version = "0.1" }
+
 #[dev-dependencies]
 
 [features]
@@ -50,6 +59,9 @@ identifier = "nwx.advotracker"
 short_description = "Online legal advice helper."
 description = "Supports lawyers to capture relevant data encountered during an online legal advice.\n"
 
+[package.metadata.winres]
+LegalCopyright = "Copyright © 2020-2021"
+
 #[[bin]]
 #//name = "policycheck"
 #path = "src/bin/policycheck.rs"