added a simple calc in Bash

Playground/gh03t/README.txt

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+--- GH03T's Simple Calc ---
+
+/- What is GH03T's Simple Calc
+
+GH03T's Simple Calc is a minimal, barebones calculator 
+written entirely in Bash, which wraps `bc` in a user-friendly
+CLI interface.
+
+/- How to Use The Calculator
+
+To use GH03T's Simple Calc, simply navigate to the `src`
+directory, and run the following Bash command, replacing <expression>
+with your expression of choice -
+
+    ./calc.sh "<expression>"
+
+Note: The expression must be enclosed in quotation marks
+to prevent bash from interpreting special characters.
+
+/- Features Included
+
+GH03T's Simple Calc supports all of the same features
+that `bc` supports, however some are more refined.
+
+For example, this calculator supports...
+
+1. The automatic removal of trailing zeros,
+2. PEMDAS / order of operations, and
+3. A (virtually) infinite expression length.

Playground/gh03t/src/calc.sh

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+#!/bin/bash
+
+# Parse Input and Args
+expression="$*"
+
+# Calculate Expression
+result=$(echo "$expression" | bc -l)
+result=$(awk '{printf "%g\n", $0}' <<< "$result") # remove trailing zeros (0)
+
+# Return Result
+echo "$result"