docs: adding .gitignore, pr template, yaml lint

.github/pr_template.yml

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+### Description
+Provide the reason of this PR.
+
+- [ ] Did you squash your commits? `git reset --soft HEAD~3` where 3 is the number of commits you want to squash.
+- [ ] Did you sign the CLA? https://gist.github.com/jamespilgrim/e6996a438adc0919ebbe70561efbb600#file-verdant-contributor-license-agreement-md.
+- [ ] Did you run build locally and ran successfully?

.github/workflows/yaml_lint.yml

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+---
+name: YAML Lint
+
+on:
+  push:
+    paths:
+      - '.github/workflows/**.yaml'
+      - '.github/workflows/**.yml'
+      - '!docs/**'
+
+jobs:
+  golangci:
+    name: YAML Lint
+    runs-on: [ubuntu-latest]
+    steps:
+      - uses: actions/checkout@v3
+      - name: yaml-lint
+        uses: ibiqlik/action-yamllint@v3
+        with:
+          file_or_dir: .github/workflows
+          config_file: .yamllint.yaml

.gitignore

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+# Visual Code 
+# Ignoring root .vscode folder. 
+.vscode/
+# Ignoring ~/build inside LMSourceCode
+/Software/LMSourceCode/ImageProcessing/build

.yamllint.yaml

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+---
+extends: default
+
+rules:
+  line-length: disable
+  new-lines:
+    type: unix
+  new-line-at-end-of-file:
+    level: warning
+  trailing-spaces:
+    level: warning