Added an iCal parser

Cargo.lock

@@ -303,6 +303,15 @@ dependencies = [
  "tokio-native-tls",
 ]
 
+[[package]]
+name = "ical"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4a9f7215ad0d77e69644570dee000c7678a47ba7441062c1b5f918adde0d73cf"
+dependencies = [
+ "thiserror",
+]
+
 [[package]]
 name = "idna"
 version = "0.2.2"
@@ -423,6 +432,7 @@ dependencies = [
  "async-trait",
  "bitflags",
  "env_logger",
+ "ical",
  "log",
  "minidom",
  "reqwest",
@@ -840,6 +850,26 @@ dependencies = [
  "winapi-util",
 ]
 
+[[package]]
+name = "thiserror"
+version = "1.0.24"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e0f4a65597094d4483ddaed134f409b2cb7c1beccf25201a9f73c719254fa98e"
+dependencies = [
+ "thiserror-impl",
+]
+
+[[package]]
+name = "thiserror-impl"
+version = "1.0.24"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7765189610d8241a44529806d6fd1f2e0a08734313a35d5b3a556f92b381f3c0"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "thread_local"
 version = "1.1.3"