Add script for creating flamegraph with perf

Resolves #8

.gitignore

@@ -1 +1,2 @@
 target
+FlameGraph

scripts/README.md

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+scripts
+=======
+
+There are two scripts included at the time this README was written, and they
+both support flamegraph generation on Ubuntu. The first script installs the
+required dependencies:
+
+```sh
+scripts/ubuntu-install-perf.sh
+```
+
+The second script will run Alacritty while recording call stacks. After the
+Alacritty process exits, a flamegraph will be generated  and its URI printed.
+
+```sh
+scripts/create-flamegraph.sh
+```
+
+**NOTE**: The _create-flamegraph.sh_ script is intended to be run from the
+alacritty project root.

scripts/create-flamegraph.sh

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+#!/usr/bin/env bash
+
+# Make sure FlameGraph scripts are available
+if [ ! -e ./FlameGraph ]
+then
+    git clone https://github.com/BrendanGregg/FlameGraph
+fi
+
+if [ ! -e target/release/alacritty ]
+then
+    echo "Must build alacritty first: cargo build --release"
+    exit 1
+fi
+
+# This will block while alacritty runs
+perf record -g -F 99 target/release/alacritty
+perf script | ./FlameGraph/stackcollapse-perf.pl | ./FlameGraph/flamegraph.pl --width 1920 > alacritty.svg
+
+echo "Flame graph created at file://$(pwd)/alacritty.svg"

scripts/ubuntu-install-perf.sh

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+#!/usr/bin/env bash
+set -v
+
+# Get kernel info
+UNAME=$(uname -r)
+
+# Install linux tools for the perf binary
+sudo apt-get install -y \
+    linux-tools-common \
+    linux-tools-generic \
+    linux-tools-$UNAME