first version of intro

Introduction/LICENSE

+BSD 3-Clause License
+
+Copyright (c) 2020, Helmholtz AI Energy
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+1. Redistributions of source code must retain the above copyright notice, this
+   list of conditions and the following disclaimer.
+
+2. Redistributions in binary form must reproduce the above copyright notice,
+   this list of conditions and the following disclaimer in the documentation
+   and/or other materials provided with the distribution.
+
+3. Neither the name of the copyright holder nor the names of its
+   contributors may be used to endorse or promote products derived from
+   this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

Introduction/Makefile

+FILE=slides
+LC=xelatex
+
+all:
+	$(LC) -synctex=1 -interaction=nonstopmode $(FILE).tex
+	$(LC) -synctex=1 -interaction=nonstopmode $(FILE).tex
+
+clean:
+	rm $(FILE).aux $(FILE).log $(FILE).nav $(FILE).out $(FILE).pdf $(FILE).snm $(FILE).synctex.gz $(FILE).toc $(FILE).vrb
+

Introduction/helmholtzai.sty

+%% V0.1
+%% 2020/10/09
+%% by Markus Goetz
+
+\makeatletter
+\def\beamer@calltheme#1#2#3{%
+    \def\beamer@themelist{#2}
+    \@for\beamer@themename:=\beamer@themelist\do
+    {\usepackage[{#1}]{\beamer@themelocation/#3\beamer@themename}}}
+
+\def\usefolder#1{
+    \def\beamer@themelocation{#1}
+}
+\def\beamer@themelocation{}
+
+\usefolder{theme}
+\usetheme{HelmholtzAI}