add usages

Signed-off-by: Pakin <pakin.t@forth.co.th>

README.md

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+# tbm-git-service
+
+Git repo as a service with operational endpoints
+
+---
+
+## Endpoints
+
+### Checkout file
+
+Get file content or list of file in directory from HEAD
+
+```
+GET .../checkout?path=<path_to_file>
+```
+
+Examples
+
+Get list of files in directory
+
+```bash
+curl -X GET http://localhost:36593/checkout\?path\=inter
+aus,common,dev,gbr,gbr_premium,hkg,ltu,mys,rou,sgp,tha,tha_premium,uae_dubai,usa,whatthecup
+```
+
+Get file
+
+```bash
+curl -X GET http://localhost:36593/checkout\?path\=inter/mys/xml/page_catalog_group_other.lxml
+
+<Popup>
+<Cache> "Enable" </Cache>
+<Width> 1080 </Width>
+<Height> 1920 </Height>
+;<Background> "0xeae6e1" </Background>
+<Volume> SoundVolume </Volume>
+<EventOpen>
+	; On open
+
+```
+
+Error
+
+```bash
+curl -X GET http://localhost:36593/checkout\?path\=inter2
+File not found
+```
+
+---
+
+### Fetch
+
+Fetching & update index of current repo
+
+```
+GET .../fetch
+```
+
+Expected result
+
+```
+{"result": "fetch success"}
+```
+
+Error
+
+```
+{"error": "..."}
+```
+
+---
+
+### Commit
+
+Commit changes of file i.e. editing, adding, etc.
+
+```
+POST .../commit
+```
+
+Body must be multipart
+
+- Single file
+
+```
+path: string
+file: text/binary is acceptable
+signature_username: string
+signature_email: stirng
+message: string
+```
+
+- Multiple file
+
+```
+signature_username: string
+signature_email: stirng
+message: string
+fileX1: text/binary is acceptable
+pathX1: string
+fileX2: text/binary is acceptable
+pathX2: string
+...
+```
+
+Example
+
+```curl
+curl --request POST \
+  --url http://localhost:36583/commit \
+  --header 'content-type: multipart/form-data' \
+  --form path=mys/version.dev \
+  --form 'signature_username=git api' \
+  --form signature_email=supra.m2.dev@forth.co.th \
+  --form 'message=test commit' \
+  --form file=@./mys.version.test
+```
+
+NOTE: file & path in multiple file must have the same name after
+
+---
+
+### Push
+
+Push local commits to remote
+
+```
+GET .../push
+```
+
+Expected result
+
+```
+{"result": "push completed"}
+```
+
+Error
+
+```
+{"error": "..."}
+```
+
+---
+
+### Pull
+
+Pull commits from remote. This operation always does git reset hard first before pull for reason of no conflicts.
+
+```
+GET .../pull
+```
+
+Expected result
+
+```
+{"result": "pull completed"}
+```
+
+Error
+
+```
+{"error": "..."}
+```
+
+NOTE: Commit did lost but could be checkout later
+
+---
+
+### Recovery
+
+WIP...