Updated Logo and added a ithub workflow to build the image as workflow

tools/github/README.md

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+# Github tools
+
+The workflow `build-and-send.yaml` allows the user to build the diploma thesis via a github workflow.
+Adapt it to meet your needs.

tools/github/build-and-send.yaml

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+name: Build and Send Diplomathesis
+
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - Diplomarbeit/**
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+
+
+      - name: Install dependencies
+        run: |
+          sudo apt-get update
+          sudo apt-get install git build-essential make-guile texlive-full pandoc pandoc-citeproc tree rsync hunspell hunspell-de-at
+
+          
+      - name: Build DA-Thesis
+        run: |
+          make pdf -C HTLLE-DA-Vorlage SOURCEDIR=../Diplomarbeit/
+
+
+      - name:  Send File via Email
+        uses: dawidd6/action-send-mail@v2
+        with:
+          server_address: smtp.gmail.com
+          server_port: 587
+          username: ${{ secrets.GMAIL_MAIL }}
+          password: ${{ secrets.GMAIL_APP_PASSWORD }}
+          subject: "Diploma thesis"
+          body: " "
+          to: ${{ secrets.TEAMS_MAIL }}
+          from: ${{ secrets.GMAIL_MAIL }}
+          attachments: Diplomarbeit/diplomarbeit.pdf