Add basic instructions to README

.clang-format

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+---
+BasedOnStyle: LLVM
+AllowShortBlocksOnASingleLine: 'true'
+AllowShortCaseLabelsOnASingleLine: 'true'
+AllowShortFunctionsOnASingleLine: Inline
+AllowShortIfStatementsOnASingleLine: WithoutElse
+AllowShortLambdasOnASingleLine: Inline
+AllowShortLoopsOnASingleLine: 'false'
+AlwaysBreakBeforeMultilineStrings: 'true'
+IndentWidth: '4'
+
+...

Makefile

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+CXX = g++
+CXXFLAGS = -Wall -O3
+
+program: main.o
+	$(CXX) $(CXXFLAGS) -o program.out main.o
+
+main.o: main.cpp
+	$(CXX) $(CXXFLAGS) -c main.cpp
+
+clean :
+	-rm *.o *.out

README.md

@@ -1,2 +1,7 @@
 # cpp-template
 
+## Instructions
+
+- Formatting: `./format.sh`
+- Building: `make`
+- Running: `./program.out`

main.cpp

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+#include <iostream>
+
+int main() {
+    std::cout << "Hello World!" << std::endl;
+
+    return 0;
+}

tools/format.sh

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+#!/bin/bash
+
+if [[ "$OSTYPE" == "darwin"* ]]; then
+  clang_format_command="clang-format"
+  clang_tidy_command="run-clang-tidy"
+fi
+if [[ "$OSTYPE" == "linux"* ]]; then
+  clang_format_command="clang-format-11"
+  clang_tidy_command="run-clang-tidy-11"
+fi
+
+eval "$clang_format_command -i *.h *.cpp -style=file"
+eval "$clang_tidy_command -fix"