Burmese Language dict and corpus (#12020)

* updated bm_dict

* ppocr/utils/dict/README.md added

* minor fix

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Co-authored-by: Zhang Jun <jzhang533@gmail.com>

ppocr/utils/dict/README.md

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+## Dictionary and Corpus
+
+Dictionary files (usually character level vocabulary) are included here for easier configuration. Corpus contributed by OSS contirbutors are listed here, please respect copyrights when using them at your own risk.
+
+- Burmese corpus:  https://github.com/1chimaruGin/BurmeseCorpus

ppocr/utils/dict/bm_dict.txt

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+က
+ခ
+ဂ
+ဃ
+င
+စ
+ဆ
+ဇ
+ဈ
+ဉ
+ည
+ဋ
+ဌ
+ဍ
+ဎ
+ဏ
+တ
+ထ
+ဒ
+ဓ
+န
+ပ
+ဖ
+ဗ
+ဘ
+မ
+ယ
+ရ
+လ
+ဝ
+သ
+ဟ
+ဠ
+အ
+ဢ
+ဣ
+ဤ
+ဥ
+ဦ
+ဧ
+ဨ
+ဩ
+ဪ
+ါ
+ာ
+ိ
+ီ
+ု
+ူ
+ေ
+ဲ
+ဳ
+ဴ
+ဵ
+ံ
+့
+း
+္
+်
+ျ
+ြ
+ွ
+ှ
+ဿ
+၀
+၁
+၂
+၃
+၄
+၅
+၆
+၇
+၈
+၉
+၊
+။
+၌
+၍
+၎
+၏
+ၐ
+ၑ
+ၒ
+ၓ
+ၔ
+ၕ
+ၖ
+ၗ
+ၘ
+ၙ
+ၚ
+ၛ
+ၜ
+ၝ
+ၞ
+ၟ
+ၠ
+ၡ
+ၢ
+ၣ
+ၤ
+ၥ
+ၦ
+ၧ
+ၨ
+ၩ
+ၪ
+ၫ
+ၬ
+ၭ
+ၮ
+ၯ
+ၰ
+ၱ
+ၲ
+ၳ
+ၴ
+ၵ
+ၶ
+ၷ
+ၸ
+ၹ
+ၺ
+ၻ
+ၼ
+ၽ
+ၾ
+ၿ
+ႀ
+ႁ
+ႂ
+ႃ
+ႄ
+ႅ
+ႆ
+ႇ
+ႈ
+ႉ
+ႊ
+ႋ
+ႌ
+ႍ
+ႎ
+ႏ
+႐
+႑
+႒
+႓
+႔
+႕
+႖
+႗
+႘
+႙
+ႚ
+ႛ
+ႜ
+ႝ
+႞
+႟