Add WIP exa and bat packages

Signed-off-by: Collin J. Doering <collin@rekahsoft.ca>

.gitignore

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+# Editor specific files
+*~
+.dir-locals.el

bat.scm

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+(use-modules (guix packages)
+             (guix download)
+             (guix build-system cargo-build-system)
+             (guix licenses))
+
+(package
+  (name "bat")
+  (version "0.9.0")
+  (source (origin
+            (method url-fetch)
+            (uri (string-append "https://github.com/sharkdp/bat/archive/v" version
+                                ".tar.gz"))
+            (sha256
+             (base32
+              "UPDATE ME"))))
+  (build-system cargo-build-system)
+  (synopsis "A cat(1) clone with wings")
+  (description
+   "A cat(1) clone with syntax highlighting and Git integration")
+  (home-page "https://github.com/sharkdp/bat")
+  (license expat))

exa.scm

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+(use-modules (guix packages)
+             (guix download)
+             (guix build-system cargo-build-system)
+             (guix licenses))
+
+(package
+  (name "exa")
+  (version "0.8.0")
+  (source (origin
+            (method url-fetch)
+            (uri (string-append "https://github.com/ogham/exa/archive/v" version
+                                ".tar.gz"))
+            (sha256
+             (base32
+              "UPDATE ME"))))
+  (build-system cargo-build-system)
+  (synopsis "A modern version of 'ls'")
+  (description
+   "exa is a modern replacement for the command-line program ls that ships with Unix and Linux operating systems, with more features and better defaults. It uses colours to distinguish file types and metadata. It knows about symlinks, extended attributes, and Git. And it’s small, fast, and just one single binary.")
+  (home-page "https://the.exa.website/")
+  (license expat))