Added the topic of How to set custom headers using a custom adaptor i…

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Build Status: INPROGRESS 🔃
Build Location: Ej2-hotfix-(custom-headers)-858871

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CI Status: SUCCESS ✅
Source Compilation: SUCCESS ✅
Build Location: Ej2-hotfix-(custom-headers)-858871
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Build Status: INQUEUE 🕒
Build Location: Ej2-hotfix-(custom-headers)-858871

[SyncfusionBuild]

Build Status: INPROGRESS 🔃
Build Location: Ej2-hotfix-(custom-headers)-858871

[SyncfusionBuild]

CI Status: SUCCESS ✅
Source Compilation: SUCCESS ✅
Build Location: Ej2-hotfix-(custom-headers)-858871
Technical Error(s): 0
Spelling Error(s): 0
Image Alt Text Error(s): 0
Image Size Error(s): 0
Image Name Error(s): 0
FT Layout Syntax Error(s): 0
Front matter Error(s): 0
File Path Error(s): 0
CodeSnippet File Path Missing Error(s): 0
Toc Anchor Tags Validation Error(s): 0
MD Tag Validation Error(s): 0

[SyncfusionBuild]

Build Status: INPROGRESS 🔃
Build Location: Ej2-hotfix-(custom-headers)-858871

[SyncfusionBuild]

CI Status: SUCCESS ✅
Source Compilation: SUCCESS ✅
Build Location: Ej2-hotfix-(custom-headers)-858871
Technical Error(s): 0
Spelling Error(s): 0
Image Alt Text Error(s): 0
Image Size Error(s): 0
Image Name Error(s): 0
FT Layout Syntax Error(s): 0
Front matter Error(s): 0
File Path Error(s): 0
CodeSnippet File Path Missing Error(s): 0
Toc Anchor Tags Validation Error(s): 0
MD Tag Validation Error(s): 0