meta: Add tig package

Sometimes theme colors are very light. This commit fixes the problem
of white text being shown on light backgrounds.

tig/.config/tig/config

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+# Make the foreground text easier to read with light background colors
+color cursor black green bold
+color title-focus black blue bold
+color title-blur black blue bold

tig/README.md

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+# tig
+
+[tig][tig] is an ncurses interface for git.
+
+## Use Cases
+
+tig can be used to:
+
+- Browse git repositories easily
+
+You should not use tig if:
+
+- You should use tig.
+
+[tig]: https://github.com/jonas/tig