Added minimum functions to be able to build libregexis024 and it's tests

.gitignore

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+.idea/
+# Never use CMAKE in production
+CMakeLists.txt
+cmake-build-debug/
+

README.txt

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+Build system for libregexis024
+
+ABOUT
+
+This is a build system in a form of header-only C++ library. It supports generation and installation of pkg-config files for your project.
+
+INSTALLATION
+
+You don't need to compile anything, this is a header-only library (more precisely, it is an only-one-file-kind library)
+
+./install.sh [header installation path] [pkg-config file path]
+
+[header installation path] defaults to /usr/include
+[pkg-config file path] defaults to /usr/lib/pkgconfig/regexis024-build-system.h
+
+HISTORY
+
+One day I realized that make is a complete garbage, cmake is even worse, and shell scripting language is too hard to use to write anything complex.
+I had to invent my own build system for my project libregexis024. But regexis024_build_system can be used for any other C++ project just fine.

install.sh

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+#!/bin/sh
+
+H_FILE="regexis024_build_system.h"
+
+if [ \! \( -f "$H_FILE" \) ]; then echo "Change cwd to root of build system source code root directory"; exit 1; fi
+
+usage(){
+    echo "Usage: ./install.sh [header installation dir path] [pkg-config file installation path]"
+}
+
+if [ $# -gt 2 ]; then usage; exit 1; fi
+
+H_INST_DIR="/usr/include"
+PC_INST_FILE="/usr/lib/pkgconfig/regexis024-build-system.pc"
+
+if [ $# -ge 1 ]; then H_INST_DIR="$1"; fi
+if [ $# -ge 2 ]; then PC_INST_FILE="$2"; fi
+
+cp "$H_FILE" "$H_INST_DIR/$H_FILE"
+
+if [ $? != 0 ]; then echo "Can't install"; exit 1; fi
+
+echo "Name: regexis024-build-system" > "$PC_INST_FILE"
+echo "Description: Cool C++ build system" >> "$PC_INST_FILE"
+
+COOL_FLAGS="-Wall -pedantic -Wno-unused-variable -Wno-unused-but-set-variable -Werror=return-type -Wno-reorder"
+COOL_FLAGS="$COOL_FLAGS -D _GLIBCXX_DEBUG -D _POSIX_C_SOURCE=200809L"
+COOL_FLAGS="$COOL_FLAGS -g --std c++14"
+
+echo "Cflags: $COOL_FLAGS -I $H_INST_DIR" >> "$PC_INST_FILE"
+