Add croc completions (#927)

Adds croc completions. Readme about tool included.

custom-completions/croc/README.md

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+# Croc
+
+[croc](https://github.com/schollz/croc) is a tool that allows any two computers to simply and securely transfer files and folders.

custom-completions/croc/croc-completions.nu

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+# author: David Telenko
+
+def "nu-complete croc curve" [] {
+    [p521, p256, p384, siec]
+}
+
+def "nu-complete croc subcommands" [] {
+    [send, relay, help]
+}
+
+def "nu-complete croc hash" [] {
+    [xxhash, imohash, md5]
+}
+
+export extern "croc" [
+    --internal-dns           # Use a built-in DNS stub resolver rather than the host operating system (default: false)
+    --remember               # Save these settings to reuse next time (default: false)
+    --debug                  # Toggle debug mode (default: false)
+    --yes                    # Automatically agree to all prompts (default: false)
+    --stdout                 # Redirect file to stdout (default: false)
+    --no-compress            # Disable compression (default: false)
+    --ask                    # Make sure sender and recipient are prompted (default: false)
+    --local                  # Force to use only local connections (default: false)
+    --ignore-stdin           # Ignore piped stdin (default: false)
+    --overwrite              # Do not prompt to overwrite (default: false)
+    --testing                # Flag for testing purposes (default: false)
+    --curve: string@"nu-complete croc curve" # choose an encryption curve (p521, p256, p384, siec) (default: "p256")
+    --ip: string             # Set sender ip if known e.g. 10.0.0.1:9009, [::1]:9009
+    --relay: string          # Address of the relay (default: "5.78.91.237:9009") [%CROC_RELAY%]
+    --relay6: string         # Ipv6 address of the relay [%CROC_RELAY6%]
+    --out: path              # Specify an output folder to receive the file (default: ".")
+    --pass: string           # Password for the relay (default: "pass123") [%CROC_PASS%]
+    --socks5: string         # Add a socks5 proxy [%SOCKS5_PROXY%]
+    --connect: string        # Add a http proxy [%HTTP_PROXY%]
+    --throttleUpload: string # throttle the upload speed e.g. 500k
+    --help(-h)               # Show help (default: false)
+    --version(-v)            # Print the version (default: false)
+]
+
+# Send file(s), or folder (see options with croc send -h)
+export extern "croc send" [
+   --zip                   # Zip folder before sending (default: false)
+   --code(-c): string      # Codephrase used to connect to relay
+   --hash:string@"nu-complete croc hash" # Hash algorithm (xxhash, imohash, md5) (default: "xxhash")
+   --text(-t): string      # Send some text
+   --no-local              # Disable local relay when sending (default: false)
+   --no-multi              # Disable multiplexing (default: false)
+   --git                   # Enable .gitignore respect / don't send ignored files (default: false)
+   --port: int             # Base port for the relay (default: 9009)
+   --transfers: int        # Number of ports to use for transfers (default: 4)
+]
+
+# Start your own relay (optional)
+export extern "croc relay" [
+   --host: string   # host of the relay
+   --ports: string  # ports of the relay (default: "9009,9010,9011,9012,9013")
+]
+
+# Shows a list of commands or help for one command
+export extern "croc help" [
+    subcommand?: string@"nu-complete croc subcommands"
+]
+
+# Shows a list of commands or help for one command
+export extern "croc h" [
+    subcommand?: string@"nu-complete croc subcommands"
+]