initial: add 'freq' cmd

Author: seigert

.editorconfig

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+# .editorconfig
+# http://editorconfig.org/
+
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+indent_size = 2
+indent_style = space
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.rs]
+indent_size = 4
+
+[*.md]
+# Preserve trailing whitespace for Markdown files
+trim_trailing_whitespace = false

.gitattributes

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+# Original at: https://github.com/scala/scala/blob/master/.gitattributes
+# fallback on built-in heuristics
+# this must be first so later entries will override it
+* text=auto
+
+# These files are text and should be normalized (convert crlf => lf)
+*.c       text
+*.check   text
+*.conf    text
+*.css     text
+*.flags   text
+*.html    text
+*.js      text
+*.policy  text
+*.rs      text
+*.sh      text
+*.txt     text
+*.xml     text
+
+# Windows-specific files get windows endings
+*.bat     eol=crlf
+*.cmd     eol=crlf
+
+# Some binary file types for completeness
+# (binary is a macro for -text -diff)
+*.so      binary
+*.dll     binary
+*.gif     binary
+*.jar     binary
+*.jpg     binary
+*.png     binary

.gitignore

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+.idea
+.vscode
+
+/target
+**/*.rs.bk

.rustfmt.toml

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+condense_wildcard_suffixes = true
+hard_tabs = false
+indent_style = "Visual"
+imports_layout = "HorizontalVertical"
+merge_imports = true
+tab_spaces = 4
+use_try_shorthand = true

Cargo.lock

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+[package]
+name = "freq"
+version = "0.1.0"
+authors = ["Alexey Shuksto <[email protected]>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+clap = "3.0.0-beta.1"
+fnv = "1"
+regex = "1"