Add provisional logo

Based on CC0 images (no attribution required):
https://www.svgrepo.com/svg/7369/calendar
https://www.svgrepo.com/svg/308476/chemistry-beaker-liquid-experiment-science

Background colour #158cba taken from Bootstrap's "btn-primary" colour.
Corner radius 20% inspired by Google Play icon guideline:
https://developer.android.com/google-play/resources/icon-design-specifications

static_common/common/images/logo-dev.svg

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+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   version="1.1"
+   id="Layer_1"
+   x="0px"
+   y="0px"
+   viewBox="0 0 600 600"
+   xml:space="preserve"
+   width="600"
+   height="600"><metadata
+   id="metadata43"><rdf:RDF><cc:Work
+       rdf:about=""><dc:format>image/svg+xml</dc:format><dc:type
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+   style="fill:#ffffff" />
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+   id="g36"
+   transform="translate(102.5,102.5)">
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+   id="path1057"
+   style="stroke-width:0.929576" /></svg>

static_common/common/images/logo.svg

+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg
+   xmlns:dc="http://purl.org/dc/elements/1.1/"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   version="1.1"
+   id="Layer_1"
+   x="0px"
+   y="0px"
+   viewBox="0 0 600 600"
+   xml:space="preserve"
+   width="600"
+   height="600"><metadata
+   id="metadata43"><rdf:RDF><cc:Work
+       rdf:about=""><dc:format>image/svg+xml</dc:format><dc:type
+         rdf:resource="http://purl.org/dc/dcmitype/StillImage" /><dc:title></dc:title></cc:Work></rdf:RDF></metadata><defs
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+   id="g6"
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+</svg>