Add exercises for individual shell tools and shell pipelines (#1)

Achieving these exercises meets all of the shell tools learning
objectives of the first two sprints.

---------

Co-authored-by: Alasdair Smith <alasdairsmith100@gmail.com>

Author: illicitonion

individual-shell-tools/README.md

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+Ahmed London 1 10 4
+Basia London 22 9 6
+Mehmet Birmingham 3 12 17
+Leila London 1
+Piotr Glasgow 15 2 25 11 8
+Chandra Birmingham 12 6

individual-shell-tools/awk/README.md

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+#!/bin/bash
+
+set -euo pipefail
+
+# TODO: Write a command to output just the names of each player in `scores-table.txt`.
+# Your output should contain 6 lines, each with just one word on it.

individual-shell-tools/awk/scores-table.txt

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+#!/bin/bash
+
+set -euo pipefail
+
+# TODO: Write a command to output the names of each player, as well as their city.
+# Your output should contain 6 lines, each with two words on it, separated by a space.

individual-shell-tools/awk/script-01.sh

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+#!/bin/bash
+
+set -euo pipefail
+
+# TODO: Write a command to output just the names of each player along with the score from their first attempt.
+# Your output should contain 6 lines, each with one word and one number on it.
+# The first line should be "Ahmed 1".

individual-shell-tools/awk/script-02.sh

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+#!/bin/bash
+
+set -euo pipefail
+
+# TODO: Write a command to output just the names of each player in London along with the score from their last attempt.
+# Your output should contain 3 lines, each with one word and one number on it.
+# The first line should be "Ahmed 4".

individual-shell-tools/awk/script-03.sh

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+#!/bin/bash
+
+set -euo pipefail
+
+# TODO: Write a command to output just the names of each player along with the number of times they've played the game.
+# Your output should contain 6 lines, each with one word and one number on it.
+# The first line should be "Ahmed 3".

individual-shell-tools/awk/script-04.sh

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+#!/bin/bash
+
+set -euo pipefail
+
+# NOTE: This is a stretch exercise - it is optional.
+
+# TODO: Write a command to output the total of adding together all players' first scores.
+# Your output should be exactly the number 54.

individual-shell-tools/awk/script-05.sh

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+#!/bin/bash
+
+set -euo pipefail
+
+# NOTE: This is a stretch exercise - it is optional.
+
+# TODO: Write a command to output just the names of each player along with the total of adding all of that player's scores.
+# Your output should contain 6 lines, each with one word and one number on it.
+# The first line should be "Ahmed 15". The second line should be "Basia 37"